▁The ▁har bour ▁was ▁known ▁to ▁se al ers ▁as ▁early ▁as ▁ 1 8 2 0 , ▁and ▁in ▁its ▁early ▁history ▁was ▁called ▁Port ▁Williams , ▁after ▁Captain ▁William ▁Smith ' s ▁brig , ▁Williams ; ▁or ▁Yan kee ▁Har bor , ▁because ▁of ▁the ▁number ▁of ▁American ▁se al ers ▁who ▁har b oured ▁there . ▁ ▁The ▁port , ▁briefly ▁called ▁Yan kee ▁Har bour ▁and ▁Port ▁Dun bar , ▁was ▁named ▁Port ▁F oster ▁after ▁Henry ▁F oster , ▁captain ▁of ▁ ▁and ▁leader ▁of ▁the ▁first ▁scientific ▁expedition ▁to ▁the ▁island ▁in ▁Jan .- M arch ▁ 1 8 2 9 . ▁ ▁The ▁expedition , ▁based ▁in ▁P end ul um ▁C ove , ▁made ▁gravit ational ▁and ▁magnetic ▁measurements , ▁produced ▁the ▁first ▁top ographic ▁map , ▁made ▁temperature ▁measurements , ▁and ▁made ▁a ▁hydro graph ic ▁survey . ▁▁▁ ▁Form er ▁names ▁for ▁the ▁port ▁have ▁remained ▁for ▁other ▁features ▁in ▁the ▁same ▁arch ip el ago ▁— ▁Williams ▁Point ▁and ▁Yan kee ▁Har bor . ▁ ▁Description ▁The ▁center ▁of ▁De ception ▁Island ▁is ▁a ▁cal der a , ▁formed ▁by ▁a ▁gig antic ▁vol can ic ▁er u ption ▁and ▁later ▁flo oded . ▁This ▁has ▁created ▁the ▁ ▁bas in - like ▁har bour ▁of ▁Port ▁F oster . ▁The ▁entrance ▁to ▁Port ▁F oster ▁is ▁only ▁ ▁wide ▁and ▁is ▁named ▁Ne pt une ' s ▁Bell ows . ▁ ▁The ▁b enth ic ▁zone ▁of ▁Port ▁F oster ▁is