There is probably a lot more money in that. The cargo will still be an insurance loss, but recovery of loads that can cause damage to marine environments are subject to mandatory reporting and fines.

If you could build a device to detect the potential for conditions leading to parametric rolling and warn crews to make adjustments I would invest in that.

https://www.marineinsight.com/marine-safety/what-is-parametr...

Interesting article! This would certainly be amenable to signal processing algorithms if you could get reliable wave height/frequency data. I suspect flying a kite doing SAR above and behind the ship (looking forward) would likely be to complicated.

I was thinking more along the lines of a ship that was outfitted with a container retrieval bay sailing back and forth along the trade routes.

Retrieval is the easy part. Locating the containers (which are often not found to be missing until arriving at port) is a MH370 scale problem.

I could believe that, that also presumes that they stay reasonably close to the surface. If they sink in the Pacific retrieval would be very unlikely.

The containers would be flooded with saltwater. Unless the container was literally full of gold (or similar), the contents are irrepairably damaged and worthless.