The most profound point on mainland Earth has been distinguished in East Antarctica, under Denman Glacier.

This ice-filled gully arrives at 3.5km (11,500ft) underneath ocean level. Just the extraordinary sea channels go further.

The revelation is outlined in another guide of the White Continent that uncovers the state of the bedrock under the ice sheet in remarkable detail.

Its highlights will be basic to our comprehension of how the polar south may change later on.

For examination, the most reduced uncovered land on Earth, at the Dead Sea shore, is simply 413m (1,355ft) beneath ocean level.

The new discovering shows, for instance, already unrecognized edges that will obstruct the retreat of liquefying ice sheets in a warming world; and, on the other hand, various smooth, inclining territories that could quicken withdrawals.

“This is without a doubt the most precise representation yet of what lies underneath Antarctica’s ice sheet,” said Dr Mathieu Morlighem, who’s chipped away at the undertaking for a long time.

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