“Flotsam” is floating wreckage, “jetsam” is cargo that is purposely thrown overboard, “lagan” is goods lying at the bottom of the ocean but reclaimable, and “derelict” is cargo at the bottom of the ocean but lost.
Oh, and a collision is the contact between two or more moving ships. An allision is one ship hitting a fixed object or moored vessel.
You Must Be From Away 
And fools who pollute our seas and land are called. . .
Good one, Kate. I can think of so many.