▁ ▁However , ▁in ▁ 1 8 6 2 ▁there ▁was ▁a ▁dis aster ▁when ▁the ▁beam ▁of ▁the ▁p ump ing ▁engine ▁broke ▁and ▁fell ▁down ▁the ▁only ▁min esh aft , ▁blocking ▁it ▁and ▁tra pping ▁the ▁min ers ▁under ground . ▁In ▁all , ▁ 2 0 4 ▁men ▁and ▁boys ▁per ished , ▁in ▁some ▁cases ▁several ▁from ▁the ▁same ▁family . ▁The ▁dis aster ▁led ▁to ▁the ▁legal ▁requirement ▁in ▁future ▁mines , ▁that ▁there ▁should ▁always ▁be ▁two ▁sh aft s . ▁The ▁loss ▁of ▁production ▁from ▁the ▁H ester ▁pit ▁sp elled ▁the ▁end ▁of ▁the ▁coal ▁trade ▁from ▁Se aton ▁S lu ice , ▁and ▁it ▁became ▁a ▁quiet ▁back water . ▁ ▁An ▁attempt ▁in ▁the ▁early ▁part ▁of ▁the ▁ 2 0 th ▁century ▁to ▁develop ▁the ▁village ▁as ▁a ▁tour ist ▁resort ▁failed ▁as ▁a ▁railway ▁line , ▁intended ▁to ▁lead ▁north ▁up ▁the ▁coast ▁from ▁Wh itle y ▁Bay , ▁was ▁partly ▁constructed ▁but ▁then ▁abandoned ▁as ▁the ▁First ▁World ▁War ▁interven ed . ▁The ▁remains ▁of ▁railway ▁brid ges ▁and ▁emb ank ments ▁can ▁still ▁be ▁seen ▁to ▁the ▁west ▁of ▁St ▁Mary ' s ▁Island . ▁ ▁Se aton ▁Del aval ▁Hall ▁ ▁The ▁Del av als ▁settled ▁at ▁Se aton ▁Del aval , ▁in land ▁from ▁Se aton ▁S lu ice . ▁There ▁was ▁already ▁a ▁Sax on ▁church ▁there ▁and ▁the ▁Del av als ▁built ▁a ▁fort ified ▁house ▁near ▁it . ▁In ▁ 1 1 0