The deep sea which there are many unknown part than the universe. hydrothermal vent, cold water gush area, ultra-deep water zone"Hadal", high concentration salt water lake of the sea. The world of the deadly poison that is filled with sulfide and methane, For me, the place that I want to visit if come true. For Deep sea creatures the corpse of the whale is an indispensable nourishment source but,the decrease in number of the habitation of the whale is in a serious state because of the human.