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The mucilage coating off a dead one. back onboard, the gravity of what we witnessed sets in. the professor says he and other scientists first observed mucilage in these waters in 2007. is this the first year, where you've seen mucilage killing coral and sea life? >> yes. yeah. of course, feel very bad because, you know, doing -- during our childhood, this ecosystem 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 ...