The idea that a smaller submarine could have struck the Kursk and sailed away, whilst the Russian giant sank to the bottom is difficult to imagine.

BBC: Aftermath of the Kursk tragedy

The giant rocket engines that propelled mankind to the moon have been retrieved from the bottom of the Atlantic Ocean.

FORBES: Moon Rocket Engines Rise From the Ocean Depths

As with any giant bank, there are enormous swings in some very big numbers that make up the bottom line.

BBC: Barclays backs chancellor's spending cuts