Underwater archaeology could benefit from the Atypical dowsing being proposed on the current dowsing thread.

more seriously, I would love to see more stuff being done off the coast.
There's a rock (not a stone, it's still attached to it's mam) off tynemouth priory that i saw afew years ago at a really low tide. I have a vivid memory of the apparent spiral erosion/carving. It looked like a swiss roll on it's side. Never quite convinced myself that it was natural.