简介：Fouradventurersdescendtothedepthsoftheoceanwhenthecableontheirunderwaterdivingbellsnaps.Therestoftheirexpedition,believingthemtobelost,abandonshopeoffindingthem.Exitingthedivingbell,thepartyfindsthemselvesinanetworkofunderwatercaverns.Theyencounterashipwrecksurvivor.Hetellsthemhehasbeentherefor14yearsandthatthereisnowayout.Thetwomenintheexploringpartybelievehimonlyafterahiketoavolcanicventthatsuppliesthecavernswithoxygen.Onthesurface,Prof.MillardWyman,theelderscientistwhodesignedtheoriginaldivingbell,decidestotryagaintoexplorethedepthsoftheocean.Hefindsoutthatthereisanotherdivingbellinexistencethatisidenticaltotheonethatwaslost.…