. ▁A ▁number ▁of ▁sink hol es ▁and ▁c aves , ▁to ▁which ▁the ▁" bo oby ▁tra ps " ▁are ▁attributed , ▁exist ▁on ▁the ▁main land ▁near ▁the ▁island . ▁ ▁Its ▁res embl ance ▁to ▁a ▁human - made ▁pit ▁has ▁been ▁suggested ▁as ▁partly ▁due ▁to ▁the ▁texture ▁of ▁natural , ▁accum ulated ▁de br is ▁in ▁sink hol es : ▁" This ▁filling ▁would ▁be ▁so fter ▁than ▁the ▁surrounding ▁ground , ▁and ▁give ▁the ▁impression ▁that ▁it ▁had ▁been ▁d ug ▁up ▁before ". ▁The ▁" platform s " ▁of ▁ro tt en ▁logs ▁have ▁been ▁attributed ▁to ▁trees , ▁dam aged ▁by ▁" b low down s " ▁( d ere chos ) ▁or ▁wild f ires , ▁period ically ▁falling ▁( or ▁was hing ▁into ) ▁the ▁h ollow . ▁ ▁Another ▁pit , ▁similar ▁to ▁the ▁early ▁description ▁of ▁the ▁" m oney ▁pit ", ▁was ▁discovered ▁in ▁the ▁area ▁in ▁ 1 9 4 9 ▁when ▁work men ▁were ▁dig ging ▁a ▁well ▁on ▁the ▁shore ▁of ▁Mah one ▁Bay . ▁At ▁a ▁point ▁where ▁the ▁earth ▁was ▁soft , ▁" At ▁about ▁two ▁feet ▁down ▁a ▁layer ▁of ▁field stone ▁was ▁struck . ▁Then ▁logs ▁of ▁spr uce ▁and ▁o ak ▁were ▁un ear th ed ▁at ▁irregular ▁intervals , ▁and ▁some ▁of ▁the ▁wood ▁was ▁char red . ▁The ▁immediate ▁susp icion ▁was ▁that ▁another ▁money ▁pit ▁had ▁been ▁found ." ▁ ▁Tre asure ▁tro ve ▁According ▁to ▁the ▁earliest ▁theory