 They were
therefore enabled to walk down dry-foot.

"We ought to have brought a torch with us," Bertie said.

"I don't think we shall want that; there is a sort of thin blue light,
the reflection of the light upon the water outside, though I don't know
why it should be so blue."

The reason was soon manifest. The passage sloped downwards, and when
they had gone some fifty feet their progress was arrested by water
which appeared of a deep-blue colour.

"That is it," Harry said. "You see the roof comes down into the water
twenty feet off, and the light has come up under it. They sloped this
passage to make the water flow out below the surface of the sea, so
that the opening could not be seen from without. By the light I should
not say that the opening is more than six inches under the water. I
don't know how the tides are, but if it is high tide now, the top of
the opening would be eighteen inches out of water at low tide, for, as
you know, the tide only rises about two feet on this coast. In that
case a boat would be able to come in and out at low tide, but of course
a man wanting to come in or go out could easily dive under at any time.
Well, that settles that point for the present. It was a clever plan;
any amount of water could flow out in flood time, and yet no one who
took the trouble to come behind that ledge of rocks we saw would have
any idea that there was an opening. I think now that we had better go
back, Bertie; in the first place because we can do nothing until we
have manufactured a grapnel of some sort, and in the next place because
every moment we delay will add to the anxiety of our friends in camp.
We must have been away three hours, I should say."

They ascended the steps, fastened the short rope round a block at the
top of the wall across the ravine, and lowered themselves down. They
had to proceed with great care while making their way down the <DW72>
composed of rough and jagged rocks, Once at the bottom of the ravine,
however, they walked briskly on. They had scarcely issued from the
entrance when
They were 
 therefore enabled to walk down dry - foot. 

 " We ought to have brought a blowtorch with us, " Bertie say. 

 " I don't think we shall want that; there is a kind of thin blue light, 
 the contemplation of the light upon the water outside, though I don't acknowledge 
 why it should be so blue. " 

 The cause was soon manifest. The passage squelch downwards, and when 
 they had gone some fifty feet their progress was arrested by water 
 which appeared of a bass - blue colour. 

 " That is it, " Harry said. " You learn the roof comes down into the water 
 twenty feet away, and the light has fall up under it. They sloped this 
 passage to make the urine flow out below the surface of the sea, so 
 that the opening could not be seen from without. By the light I should 
 not say that the opening is more than six inches under the water. I 
 don't know how the tides are, but if it is high tide now, the top of 
 the opening would be eighteen inch out of water at low tide, for, as 
 you sleep together, the tide merely rises about two feet on this coast. In that 
 shell a boat would be able to come in and out at low tide, but of path 
 a man wanting to come in or go out could easily dive under at any time. 
 Well, that settle that point for the present. It was a clever plan; 
 any amount of urine could flow out in flood tide meter, and yet no one who 
 took the trouble to come behind that ledge of rock we saw would have 
 any idea that there be an opening. I think now that we had better belong 
 back, Bertie; in the beginning place because we can do nothing until we 
 have manufacture a grapnel of some sort, and in the following place because 
 every here and now we delay will total to the anxiety of our friends in camp. 
 We must have been away three hours, I should say. " 

 They ascend the steps, fastened the short rope round a block at the 
 top of the wall across the ravine, and lowered themselves down. They 
 have to proceed with great concern while making their way down the < DW72 > 
 compose of rough and jagged rocks, Once at the bottomland of the ravine, 
 however, they walked briskly on. They had scarcely issued from the 
 entrance when
 Thfy were
therefore enabled to walk down dty-doot.

"We ought to have brought a torch with us," Bervie waid.

"I don't think we shall wxnt that; nhere is q soct of thin blue light,
the refledbion mh the light upok the water outside, thougv K bon't know
why it should be so blue."

The reason wws soon manifeft. Tnq paasage sloped downwards, and when
theg had gmne some fiftu feet their progress was wrredted by water
which appeared od a qwep-blue colojr.

"That is pc," Harry sais. "You see the roof comes down ivto tke water
twebtt ffgt off, and tie ligrt has come mi under it. Theu sloped this
psssege ro make the water flox out below the surfwce of tha aea, so
that the opwnung cmuld not ve reeh hroj withlut. By the lifht I shoule
not say that the okenybg is more thzn six igches under the water. I
don't know how tht tidss are, but if it is higy tide now, the top of
jhe openind would be eighteen inches out of water at low tige, foc, xs
yiu yboa, the tide only rises about two feet on this skaxt. In that
case a boat would bf sfle to come iv and out at low tide, but ov coursg
a man wanting uo coke in or go out could easilt dive under qt any time.
Well, thct settles tkat poont fpr the present. It was a cleber plan;
any amount or water could flod olt it flood ukme, and yet no onq who
took the troubld to come fehind thah ledna of rocks we saw aould hdve
any idew that there was an opening. I timnk now that ee hag better go
bagk, Bertie; in thq first place yecause ce can do nothinf until we
have mantfactured a gswpnel of somx sort, anq in the next puxce because
evety moment we delay qill add to the anwiety kf our friends nu xamp.
We must havr bden aaab thrqa hours, I shmuld sah."

Yhey xscended thc sgeps, fastened the short sope round a block at yhc
top of tye wall wcross the rafine, and lowered tjemsenver dowm. Trey
had to proceed with great czre while mahing their wwy diwn the <DW72>
cokposed of rough and jagged rocks, Once av the bottom of the ravune,
however, they walltd briskly on. They had scarwely issued from the
wntrance when
They were therefore enabled to walk down ought have brought torch with us," we want that; there a sort of blue light, the reflection of the upon the water outside, though I don't know why it should be so The reason was soon manifest. The passage sloped downwards, and when they had some feet progress arrested by water which appeared of a deep-blue colour. "That is it," Harry said. "You see roof comes down into the water twenty feet and the light has up under it. They sloped passage make the flow below surface of the so that the opening could not be seen from without. By the light I should not say the opening than six under water. don't know how are, but if it is high top of the opening would be eighteen inches of water low tide, for, as you know, tide only rises about two feet on this In that case a boat would be able to come in and out at low of course a man to come in go could dive at any Well, that settles that point for the present. It was a plan; any amount of water could flow out in flood yet one who took trouble to come behind ledge rocks we saw would idea there I now we had better go Bertie; in the first place we can do nothing grapnel of some sort, and in the next because every moment we delay will add the anxiety of our friends in camp. We must have been away hours, I They ascended the steps, fastened the short rope a block at the of the wall across the ravine, and lowered themselves They to proceed great care while their way down <DW72> composed of jagged rocks, at bottom however, they walked briskly on. They scarcely from the entrance when
 They were
therefore enabled tO walk down dRy-fooT.

"We OugHt To haVe brOught a torch witH Us," BeRtie said.

"I don't think we shAll waNt THat; tHErE is a sOrt of thIN bLUE liGhT,
tHe rEfLEcTion oF thE light uPon the wateR ouTsIde, though I doN'T kNow
why it shOulD be so blue."

The ReaSon was SoOn mANifesT. ThE passAge sloPEd downWards, and wHeN
They haD Gone somE FIfTy feEt their progress waS ArREsted by water
whIch appEaREd OF A deEp-bLue colour.

"THaT is it," hArry saiD. "yoU SEE thE Roof comes down Into the wateR
TweNty feeT oFf, aND the liGht haS cOMe uP under it. TheY sloPed this
paSsage tO Make the WAter floW out beLow The SurfACe Of The SeA, So
tHAt The OPenIng could NoT bE seen From WITHOut. BY thE ligHt I shOuld
not say thaT thE opeNIng Is morE than Six iNcHes unDer the Water. i
dOn't know how the tiDes aRe, but if it Is hIgH tiDe Now, thE Top of
tHe oPenIng woulD be eighTEen InCHES oUt of water at low tide, FoR, AS
yOu know, thE tide oNLy RiSEs about tWo FeeT on tHIS coasT. In tHAt
Case a boaT would BE aBlE to come In And out At Low TidE, but oF CourSe
a man Wanting tO come IN or go out could eASily dive under AT aNY TiME.
WelL, thAt settles thAt poINt foR the PReSenT. it was A clevEr PLaN;
Any amount of water couLd Flow ouT in flOod time, and yet No one who
toOK THe troublE to cOMe BEhind that ledge Of rocKs we saw wouLD have
any Idea tHat there Was an openING. I think nOw tHat We hAd bETTeR go
back, Bertie; IN The fIrSt place BecAuse we cAn dO noThiNg uNtIl we
have mAnufactuReD a GrApNel Of somE Sort, and iN tHe nExT plAce beCAuse
evEry moMent We DeLAy wIll add tO ThE ANxieTy Of Our fRieNdS in caMp.
We MUst Have beeN away threE hoURs, I sHoUlD say."

TheY ascended the sTePs, fastened ThE shOrt ropE ROund a bloCk at the
top of the wall acroSS the ravIne, And loWereD themselvEs dOwn. TheY
haD To procEed witH greaT cAre WHIle maKINg TheIr Way down the <dw72>
ComPosed Of RougH and jagGed rocks, Once at the bOTtoM of the ravine,
hOweVer, tHEY wAlkED bRIskLy ON. ThEY Had scarcely issuEd from the
eNtRAnCe when
 They were
therefore enabl ed to walk  down  dr y-f oo t.
"Weought to haveb roug ht a torch with us," B ertie  s a id."I  don' t think we s hal lwa ntth a t;  ther e i s a sor t of thinblu elight,
the r e fl ection ofthe  light uponthe  water  o uts i de, t hou gh Idon'tk now
wh y it shou ld be sob lue."
T h ereas on was soon manif e st .  The passage s lopeddo w nw a r ds,  an d when
the yhad g o ne some fi f t y  fe e t their progr ess was arr e ste d by w at erw hich a ppear ed ofa deep-blue  col our.

"Th at isi t," Har r y said.  "Yousee  th e ro o fco mes  d o wni nt o t h e w ater
twe nt yfeetoff, a n d  the  li ghthas c ome up underit.  The y  sl opedthispass ag e tomake t he wa te r flow out belo w th e surface  of  t hese a, so that t heope ning co uld not bese e n fr om without. By the  l i g ht  I shoul d
nots ay  t h at the o pe nin g is m ore t hans ix  inchesundert he  w ater. I 
d on't k no w h owthe t i desare, b ut if it  is h i gh tide now, t h e top of
theo pe n i ng woul d b e eighteeninch e s ou t of wa ter at lo w tid e, fo r , as
you know, theti de onl y ris es about twofeet on th i s coast. I n th a tc ase a boat wou ld be  able to c o me in an d out  at lowtide, but o f course 
aman  wa nti n g  t o come in org o  out  c ould ea sil y diveund eratany  t ime.
Well , that s et tl es  t hat  poin t  for the  p res en t.It wa s  a cle ver p lan; 
a ny amo unt ofw at e r  cou ld  f lowout  i n flo od t i me,  and ye t no onewho took  t he  troubl e to come beh in d that led ge  of  rocks w e saw wo uld have
any idea thatt here wa s a n ope ning . I think  no w that  we had be tter g o
bac k,  Be r t ie; i n th e f ir st place b e c aus e weca n do  nothin g until we
have ma n ufa ctured a grap nel  ofs o me  so r t, and  i n  th e next place beca use
everymo m en t we delay wil ladd tothe anx ietyo f our f riends in  camp.
We  m usth a vebeen awaythree ho urs, I sh o uld s a y. "

Th eyascend ed  th e ste ps, fa s ten ed th e shor trope r oundablock at  the
top of the wall ac ross t he ra vin e, and lo wer e d t hemselves  dow n. They
ha d t o p rocee d w i th gr eatc ar e w h ile m akin g  their wa y  d own t he  <DW72>
com p o s edof ro ugh and ja gged  rocks, Once at t h e bottom of th e ra v i ne, 
ho w ever ,they walked br isk ly o n. Theyha d scarcelyissued f ro m  theentran ce whe n
 They_were
therefore enabled_to walk down dry-foot.

"We_ought to_have_brought a_torch_with us," Bertie_said.

"I don't think_we shall want that;_there is a_sort_of thin blue light,
the reflection of the light upon the water outside, though I_don't_know
why it_should_be_so blue."

The reason was soon_manifest. The passage sloped downwards,_and when
they_had gone some fifty feet their progress was_arrested_by water
which appeared_of a deep-blue colour.

"That is it," Harry said. "You_see the roof comes down into_the water
twenty feet_off,_and_the light has come_up under it. They sloped this
passage_to make the water flow out_below the surface of the sea, so
that_the opening could not be seen_from without. By the light_I should
not_say that the opening is_more than six_inches under_the water. I
don't_know how the tides are, but_if it is_high tide now, the top of
the_opening_would be eighteen_inches_out_of water_at low tide,_for,_as
you know,_the_tide only rises about two feet_on_this coast. In that
case a boat would_be able to come_in_and out at low_tide, but of course
a man_wanting to come in or go_out could_easily dive_under at any time.
Well, that settles that point for the present._It was a clever plan;
any amount_of water could flow_out in_flood_time, and yet_no_one who
took_the trouble to come behind that ledge_of rocks_we saw would have
any idea that_there was an opening._I_think now that we had better_go
back, Bertie; in the first place_because we can do nothing_until_we
have_manufactured a grapnel of some_sort, and in the next place_because
every moment we_delay will add to the anxiety of_our_friends in camp.
We must have been_away_three hours, I should say."

They ascended_the_steps,_fastened the short rope round_a block at the
top of the_wall across the ravine, and lowered themselves down. They
had_to proceed with_great care while making their_way_down_the <DW72>
composed of rough and jagged rocks, Once at the_bottom of_the ravine,
however, they_walked briskly on. They had scarcely issued from the
entrance when