Twohighlevelscuba-diversandlong-timefriends,DonandDave,brokeaworldrecordfordepthintheBoesmansgatcaveinSouthAfrica.Itwouldtakethem15minutestoreachthebottom,but12hourstosurface.Havingreachedthebottom,againstallodds,theyfindabody.Theydecidetocomebackandretrieveit.Theycalltheparents,enrol8fellowdivers,andhireacameramantodocumentthedive.Thecamerawillfollowthemthroughoutthepreparationandthedive,includingtothebottomofthecave.Littledidtheyknowthatonthathistoricdive,Davewouldnotbecomingback.Inthistimeofover-performancedrivenbyself-promotionandself-filmingcomesBoesmansgat,astoryoflossandmourningwhereegoismandaltruism,hubrisandself-control,risk-takingandspiritualityallgohandinhand.Acascadeofchoicesandtenseparadoxesthatleadtoatragedylongforeseen,yetimpossibletoprevent.WrittenbyAADP