1.   Britain has put a similar deep search and rescue submarine on standby.

2.   But after Russian officials finally requested international help on Wednesday, Great Britain dispatched a smaller rescue submarine.

3.   The British rescue submarine arrived in Trondheim, Norway, from Scotland on Wednesday.

4.   The British rescue submarine could make its first dive Sunday morning, officials said.

5.   A British navy team with a sophisticated rescue submarine was heading to the area on a ship.

6.   After refusing Western aid, Moscow asks Britain and Norway to send rescue submarine and divers.

7.   The Russian navy tried for more than a week to open its emergency escape hatch with one of its own miniature rescue submarine.