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Rescuers look at using explosives to free Russian sub.

The vessel is caught up in an underwater antenna that's part of an electronic coastal surveillance system, Interfax said, citing Admiral Viktor Fyodorov, commander of Russia's Pacific Fleet. The antenna is attached to an anchor weighing 60 metric tons, which rescuers are preparing to blow up, Interfax said.

"A decision has been made to blow the anchors up," Fyodorov said, according to Interfax. An operation taking one to four hours would then begin later today to lift the sub from a depth of about 625 feet (190 meters), said Interfax, citing Deputy Navy Chief of Staff Vladimir Pepelyayev.