In an abyssal chasm yawning deep beneath the Indian Ocean, a vast 'city of the dead' has slowly been growing in the frigid darkness.

In the Indian Ocean, a deep-sea area roughly 1,200 kilometres long and 7 kilometres deep was found to harbour an ecological landmark site of whale remains.

Researchers uncovered an enormous deep-sea accumulation of whale remains in the southeastern Indian Ocean, showing long-term, specialized ecosystems and an extensive fossil record…