UFOs are typically observed in the sky, but there have also been numerous sightings of objects emerging from beneath the waves.
Planetary scientist Prof Monica Grady examines Loeb's claims concerning spherical metallic fragments found on the ocean floor.
The man had been attempting to run across the entire Atlantic Ocean using a crude hamster wheel contraption.
The unidentified object, which has been likened to one of the eggs from the movie 'Alien', was found off the coast of Alaska.
Scientists have discovered an entirely new ecosystem filled with exotic life forms beneath the ocean floor.
As if visiting the Titanic wasn't risky enough, imagine living in a colony suspended in the clouds of another world.
The Harvard astronomer recently claimed to have found evidence of alien technology on the ocean floor.
These tiny metallic spherules were found during the search for the remains of IM1 - the first recognized interstellar meteorite.
Search and rescue officials have revealed that parts of the missing sub have been found on the ocean floor.
Scientists have discovered evidence of phosphorous in data previously collected by NASA's Cassini spacecraft.
Revisited data from the Voyager 2 probe seems to point to the possibility of not only oceans, but habitability as well.
The surprising find pushes the boundaries of just how deep down in the ocean fish are capable of surviving.
NASA's flagship Artemis I mission has come to a successful close with a dramatic splashdown in the Pacific Ocean.
The NOAA's Okeanos Explorer vessel has discovered something strange and nobody seems to know what it is.
The Harvard astronomer believes that a meteoroid that fell to Earth in 2014 could contain alien technology.
An intriguing impact crater on the ocean floor seems to be the same age as the impact that wiped out the dinosaurs.
Scientists have identified a relatively nearby exoplanet that appears to be made up almost entirely of water.
The NOAA has appealed to the public for help explaining the presence of a line of holes at the bottom of the sea.
Experts have been attempting to determine what gave the unusual ocean-dwelling giant its distinct coloration.
Park staff at Cape Lookout National Seashore posted up images of the organisms to ask if anyone could help identify them.