She cost around £1billion to build, has sonar so sensitive it can hear other vessels 3,000 miles away and carries a giant payload of 38 deadly Tomahawk cruise missiles.

HMS Ambush, the Royal Navy’s newest nuclear attack submarine, is one of the most sophisticated and powerful vessels of her type ever built.

The giant Astute-class sub, which was launched today, is so hi-tech she doesn’t even need a periscope.

Scroll down to watch the submarine’s weapons being tested…see more