The United States does the same thing. Boats are cleaned out to be enviromentally friendly as per IAW SOP and sunk by various methods.
I've witnessed several former drug boats off the shores of Florida bombed by the USAF and others rigged to explode by certain miltary units. Most are in depths where divers can enjoy them.
In other instances such as illegal imigration, we removed the people then shot the living crap out of them with 25mm HEI or burned'em to the water line in front of the illegals hoping to discourage further attempts.
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