Southwest of Pylos, Greece, lies the deepest point in the Mediterranean Sea, in the so-called Calypso Trench. Specifically, 5,267 meters separate the surface from the deepest point. The landscape of an inhospitable desert sunk in the darkness of the sea would be the most predictable scenario, but researcher Miquel Canals' team has confirmed that there is human presence even at the deepest point in the Mediterranean. Remains of garbage bags, cans, and plastic bottles are some of the traces identified by a manned submarine that descended into the trench with the help of pioneering technology.

Sir David Attenborough opens his documentary Ocean with a sentence: "After almost a century on this planet, I now understand that the most important place is not the land but the sea." He says this from the sand of an Atlantic Ocean beach and, with his ability to listen, tells us about the mysteries that have historically surrounded the seabed. "We live in the era of the greatest oceanic discoveries. For many of us, the marine world remains dark, feared, and dangerous, far from our sight and, without a doubt, beyond our imagination," says Attenborough, who reminds us that humankind has explored other planets more than the ocean floor.

Manta rays are oceanic animals that live in the open sea and in tropical climates and usually measure about 3 meters in wingspan. Although a few years ago it was a very rare phenomenon, More and more giant manta rays are arriving on the Mediterranean coastsThis is baffling marine biologists, who are trying to figure out what these animals are doing in Catalonia, Valencia, and Murcia, and even in other countries, such as Italy and France. Civil Protection sources point out that the lifeguard ordered the swimmers to leave the water.

In the mid-1980s, a diver was exploring the Ryukyu Islands, off the southern coast of Japan. What he didn't expect was to stumble across one of the archaeological mysteries that still intrigue geologists today. Yonaguni is surrounded by theories about its origin: was it natural or was it built by humans? Its rectilinear and symmetrical shapes are what led some to believe the monument could be a megalith built at the end of the last ice age.