Who invented the helmet to be able to dive?

Who invented the helmet to be able to dive?

  The first dive helmet was designed by an Englishman named Charles Deane in 1823 to be used by firefighters in situations in which had to cope with fire and smoke. However firefighters quickly discovered that not it favored them go to put out fires with a mass of...
The sound underwater

The sound underwater

Did you know that the speed of propagation of sound in water is 10 times faster in the air. Sure many times swimming we have heard a noise of a ship’s engine, but when we searched the boat, we see it very remote. For this reason in contrast to the surface, in...