Myself I would like to see what is under the Teredo Crust(wood worm poop)they have been working on. There must be something there or they would not be using 20 tanks of air per day on it. That is alot of bottom time at 40ft(if that's the depth they are diving). We should just let them dive and try to be patient. If not we will be come the patient!!
Understood on your 'what's quickest' scenario. My preference for the Ledge is weighted both by impatience (well, I've been involved since 05/06, so that might be excusable) and by "probability of actual significant treasure", going by Ed's earlier opinions of the potential richness of the deep one.
I can't believe you said taint on a public thoroughfare..