According to a natural law called "Archimede´s principle", any object immersed in a fluid experiences an up-thrust force (buoyant force) equal to the weight of fluid displaced. If such force exceedes the object´s weight, the object floats. If not, it sinks.Read more

The sea bottom is literally covered with wrecks! If you think that human beings have been navigating from more than 10.000 years, imagine how many boats have sunk! Recovering a shipwreck is a huge work, and a very expensive one. That´s the reason why not so many wrecks get fished out.
Modern instruments like sonars, cameras and radars help monitoring wrecks that archaeologists or authorities may decide to leave submersed. In such cases, wrecks may become exciting dive locations and underwater archaeological sites.

The bottom of the sea is full of very interesting things. You can find wrecks of planes, submarines and many kinds of boat belonging to any period and time. Even a wooden boat from the past can survive more than 1000 years under the sand!!! But also is possible to find different things as weapons, like  unexploded bombs, ore more ancient cannons, swords, scaffoldings and many other things fallen into the water during the battles of the past.

Seas and oceans may be very dangerous, and deserve huge respect when we sail, dive or even swim. In the ancient times, in every country and culture, the god or the goddess of the sea was always somebody big, powerful, and particularly nervous and cranky.  Actually, seas may appear in this way, something that changes suddenly, from very calm to very stormy.

Of course there are! Baia is an ancient submerged town laying just in front of Naples, in the Mediterranean Sea. Port Royal is a Caribbean one. And you can find many more! As far as Atlantis is concerned, the legend deals with an island (or even an entire continent) that disappeared to the depths in one day and one night. The event was reported by Plato, the famous Greek philosopher living in the IV Century BC, and may refer to Santorini, in the Aegean Sea. The island was submersed following a devastating eruption in the XVI Century BC.Read more

Submarines can stand water pressure thanks to their shape. As submarines are roughly ovoidal or "rounded", pressure is equally distributed on their whole surface. In a few words, an object having a round shape stands much more pressure than a squared one. But of course a submarine cannot go deeper and deeper. There is a limit that also a submarine must respect to avoide being smashed. The material does not really make the difference. In fact there are fishes that live in the dark depths.Read more

History tells that they have always been existing, but science does not support these legends. In the ancient times mermaids were usually located in very dangerous places, acting like guardians or keepers of whirlpools, hidden rocks or something dangerous for sailing. Although we tend to imagine mermaids as nice creatures in present-day tales, ancient mermaids were fascinating yet dangerous beings that could play a role in ship crashes or sinkings. Read more

The sea, as the earth is of course full of dangers. Dangerous can be a storm, a whirlpool, can be a fish or an animal. For instance in the Mediterranean sea, a fish called Tracina is very dangerous also for human beings because of its poison. As Tracina, there is also Tetraodontis, or a jellyfish that can be dangerous