Laurentian Abyss

The Laurentian Abyss is the second deepest deepest part of the Earth's ocean.

Fiction

Transformers (2007)

The United States government dropped all of the defeated Decepticons into the Laurentian Abyss. It was hoped that the extreme pressure and temperature of the Abyss would destroy bodies of the Decepticons, hiding the evidence from the unknowing populace of Earth. Transformers

From Teletraan I: The Transformers Wiki, a Wikia wiki.