I hope they find Atlantis, but I suspect something else. There is a plan to find the extraterrestrial origins of life on earth --a hypothesis to be tested-- by drilling down to depths that would have been the surface a billion years ago. Most all of that is deeply buried so the present surface is relatively fresh all the time. Micrometeorite dust is still coming in at a rate that would bury everything a foot deep every million years, or something like that. I think they will eventually find completely lost cities and civilizations, very old and scattered all over the planet. I don't know how old they might be, but 50,000 years is not out of the question. Maybe more. I also suspect that technology 6000 years ago was more advanced than it was 1000 years ago. The first books I checked out of the library when I was old enough to go into the adult stacks were Velikovsky's, so I have probably been hopelessly spoiled as far as archaeology is concerned. I have seen the ruins at North Salem personally, they are very much out of place both in location and time, just like Stonehenge and the dolmens. We know people were sailing all over the planet 40,000 years ago, don't we?
An Atlantean Empire? Not likely.
Atlantis? Not likely.
Many prehistoric civilizations? Most likely.
Atlantis? Not likely.
If you believe in numerous 'near-extinction' events, as I do (most recently at 540AD, The Dark Ages), it is amazing that any information from our distant past makes it through that 'filter(s).' Any information that survives through these events at all is amazing and likely to be very sketchy, garbled and misinterepted. (most certainly we have many things wrong.) Plutarch, visited Carthage years after it was sacked and reported seeing records in the ruins of transAtlantic trade with a great power on the western side of the Atlantic. (The Sea People?)