Not really. Clean metal is fine and so are food products. Clean metal can help form reefs and such, why the Navy sinks ships. Food waste, like apple cores and such, all biodegradable. But the trash has to go somewhere. So things that doesn't really hurt the ocean and break down, it goes in the ocean. Things that can actually hurt the ocean and won't break down get flow off the ship during resupply missions and get disposed of properly on land somewhere.