BBC: Scientists have seen evidence for a colossal flood under Antarctica that drained six billion tonnes of water, quite possibly straight to the ocean.
The cause is thought to be a deeply buried lake that suddenly over-topped.
Satellites were used to map the crater that developed as the 2.7km-thick overlying ice sheet slumped to fill the void left by the escaping water.
The peak discharge would have been more than double the normal flow rate of London's River Thames, researchers say.
The...