The new study makes the case that the massive dip, called the Indian Ocean geoid low (IOGL), is made up of slabs from the long lost Tethys Ocean that sunk within the planet.

Contour plot of the predicted Indian Ocean geoid low (IOGL) superimposed over predicted temperature anomalies in Case 1. (c) Contour plot of the observed IOGL superimposed over temperature ...

Scientists have puzzled over the origins of a gravity hole in the Indian Ocean for years. Now, researchers think the sunken floor of an extinct ocean could be the cause.

Scientists have puzzled over the origins of a gravity hole in the Indian Ocean for years. Now, researchers think the sunken floor of an extinct ocean could be the cause.