剧情介绍：　　Combiningunderseaexplorationwithinnovativevisualizations,DRAINTHEOCEANSrevealshiddenevidenceofamazingunderseamysterieseee　　Not“artistsimpressions”butwhatisactuallythere—downtotheverylastrivet.And,foritsfourthseason,itembracesagrippingnewstyle,tellingstoriespurelythroughthewordsofexplorersandarchaeologists,puttingviewersrightbytheirside.