The teams survey gas hydrate fields near the Saint Petersburg mud volcano.  The Mir-1 manned submersible descends near the volcano under the command of pilot Viktor Nishcheta, with the crew also including experts from the P. P Shirshov Institute of Oceanology and the Federal Space Agency (Roskosmos).  The team spends six hours studying the gas hydrates’ properties at a depth of 1,400 meters.