Footage from a new docuseries that seeks to prove the existence of aliens appears to show an unidentified aircraft descending into the English Channel.

Netflix's Investigation Alien follows journalist and ufologist George Knapp as he assembles a crack-team to prove their existence - and it has yielded evidence such as this. 

An expedition commissioned for the Knapp docuseries captured the clip - their second sighting that night.

First, as they operated an ROV off the French coast of Normandy, they saw an illuminated object roughly 200 yards in the distance, first stationary, then speeding away.

It returned hours later, however, when everyone except the night crew was asleep - before plummeting into the waters below. An eagle-eyed mariner was able to capture it on film - seemingly leaving the minds behind the new series at a loss.

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