Whale graveyard dating back five million years discovered

An enormous whale graveyard around 1,200km (745 miles) long has been discovered in the south-eastern Indian Ocean.

The site, which is 7km (four miles) deep, has been found in the Diamantina fracture zone, a range on the sea floor of ridges and trenches.

But it is the age of the remains - some from 5.3 million years ago - that has prompted huge excitement in the scientific community.

The underwater necropolis, which was discovered by a team of researchers from China, Italy and New Zealand, is teeming with organisms and species that "may be new to science", according to journal Nature .

One of the study's authors Xiaotong Peng of the Chinese Academy of Sciences said: "Discovering a necropolis of this scale was completely unexpected.

"The size of distribution, the depth and the age range were far beyond anything we had imagined."

During 32 dives to the site, explorers collected samples from 485 whale-fossil sites and active whale falls, and found a treasure trove of remains, including one extinct whale's skeleton.

The beaked Pterocetus benguelae, which is 5.3 million years old, was discovered to be one of the fossilised skulls in the graves.