When I watched this video, I tried to think whether it was "flotsam" or "jetsam" that was being created. Neither, actually:
- Flotsam is floating wreckage of a ship or its cargo.
- Jetsam is part of a ship, its equipment, or its cargo that is purposely cast overboard or jettisoned to lighten the load in time of distress and is washed ashore.
- Lagan (also called ligan) is goods or wreckage that is lying on the bottom of the ocean, sometimes marked by a buoy, which can be reclaimed.
- Derelict is cargo that is also on the bottom of the ocean, but which no one has any hope of reclaiming (in other maritime contexts, derelict may also refer to a drifting abandoned ship).