'We are rewriting the textbooks': first dives to Amazon coral reef stun scientists

Scientists have discovered the river reef is far bigger, and more important, than first thought – a biodiversity hotspot on a par with the Great Barrier Reef. Now they face a race to protect it from big oilThere is a flickering, bright glimmer of sky as the two-person submarine descends beneath the muddy equatorial waters to a place no human has ever seen – a vast, complex coral reef at the mouth of the world’s greatest river.Thirty metres under the murky plume of the sediment-