during our childhood, this ecosystem is is was was a rich ecosystem. even one year ago, you know, they are healthy. they were healthy. you know, one year ago. but now, it s bad. reporter: a year ago, this is what the underwater life looked like here. this is the exact same spot, today. professor mohammed a plankologist takes a surface sample. he describes mucilage as a dense, organic soup, mostly, made up of bacteria, fie phytoplanktons secretions. one of the species that he says is one ingredient in that deadly nastiness underwater. the sea is just like a coronavirus patient, who has been intubated, the professorer explains. because the oxygen, at the greater depths is almost completely depleted.