A Trident missile test-fired by a UK submarine failed. That's a lot of money down the drain.

• A test of Britain's nuclear deterrent system ended in failure for the second time. 
• The incident involved a $70 million Trident missile that both the US and UK have in their arsenal. 
• Their high price is part of the reason these missiles are rarely tested by the British Navy.

The British navy suffered an embarrassing flop after a failed test launch of a Trident nuclear missile was revealed.