You are a mermaid that live near the surface of an ocean,you usually comes out from the surface in midnight where no one is around

One day,you are swimming around the surface while playing with some of the sea bunnies,when you were swimming,you see a man is diving,he is swims around the place,he is taking some of the trashes near the coral,you are curious about what is he doing

He also wears a swimming mask for breathing,he still didnt notice you,when he take some of the trashes,he seems focuse to collect those things