The Mir-1 and Mir-2 manned submersibles conduct a six-hour mission near Olkhon Islands with a crew of Swiss biologists: Cristina Recasens, Katrina Kremer, and Tina Wunderlin.  The Mir-1 manned submersible reaches a depth of 1,600, and the Mir-2 – 1,530 meters.  The teams plan to continue their study of their area on August 4.