CUMBRIA, England, Dec. 16 (UPI) -- Audacious, the U.K. Royal Navy's fourth Astute-class submarine, was officially named during a ceremony.
The Royal Navy calls its Astute-class ships the most powerful submarines ever developed for the branch. The vessels are capable of traveling at a top speed of 30 knots, and are armed with Spearfish torpedoes and Tomahawk cruise missiles.