The Atlantic Ocean formed when Africa and South America split apart in the Jurassic Period.

resulted in a shallow seabed being left off the coast of Guinea's west coast.

In 2017, Nicholson was perusing oil and gas exploration vessels' seismic sweeps of the area.

Upon close inspection by oil and gas exploration vessels, a peculiar feature became immediately apparent: a 5 cm wide dimple concealed deep within the cake.

Nicholson's more in-depth investigation of the site, published in today's issue of the journal Science Advances, suggests that this is the case.

the hole from a meteor as wide as the Eiffel Tower is tall. If this is confirmed to be a void, it would

have hit Earth within a million years of the Chicxulub impact, which wiped out the dinosaurs.

To avoid relying on methane bubbles, Nicholson searched for other explanations for the dimple.