There is a Google+ hangout from National Geographic with Robert Ballard, James Cameron, Jane Goodall, and Explorers Around the World.
Sunday, January 13th at 1 p.m. ET (6 p.m. UTC).
Quote from Google+ post:
"We're bringing together Robert Ballard, James Cameron, Jane Goodall and explorers from all seven continents.
Use #NatGeo125 to ask questions here or on YouTube and tune in to the Hangout on Air this Sunday, January 13 at 1 p.m. ET (6 p.m. UTC).http://on.natgeo.com/WEBZcd"