ghost net
fishing net left or lost in the sea, tangled on a reef or drifting in the open, potentially entangling animals
en-US/ˈɡoʊst ˈnɛt/
en-GB/ˈɡəʊst ˈnɛt/
fishing net left or lost in the sea, tangled on a reef or drifting in the open, potentially entangling animals