The only way this is sustainable is if the owner goes out to where the transponderless fishing fleets are and torpedoes them to the bottom of the ocean
And tow them outside the environment
nice reef builders, hopefully
Superyacht submarine, now titanium LEED certified and made from sustainable materials.
It automatically recycles into an artificial reef.
Technically that's reuse, which is one R greener than recycle.
Since it's entirely made up it's completely climate neutral[1].