The human-occupied vehicle Thetis floats over top of a shipwreck site thought to be about 200 yrs old. Sections encrusted with marine life provide clues to the chemical makeup of the ship’s cannons (perhaps iron) as they act as a mineral source for marine life. Resting in the photic zone (water exposed to sunlight), marine life has flourished over the wreck site and recycled most of the materials, leaving only ceramics and large metal objects remaining. Image courtesy of Richard Camilli, Project PHAEDRA 2006, WHOI, HCMR, Thera Foundation, NOAA.
