[djbusby]

Tyres. For a reef (obviously)

https://en.m.wikipedia.org/wiki/Osborne_Reef

[reaperducer]

I seem to remember that back in the 80's, IBM sunk a metric assload of hard drives off the coast of Boca Raton to make a reef.

This was something that happened more than five days ago, so nothing came up when I did a Google search.

[ChoGGi]

https://www.gillware.com/hard-drive-data-recovery/hdd-burial...