During the dive your nose will want to naturally breath in, or take in water so having the nose under the mask helps that NOT to happen. Also if you take on water inside your mask and your nose is not within it will be VERY difficult for you to empty the water.
To empty water from your Scuba mask at depth you simply pull it out from your face and breath out through your nose and this causes the water to pour out. How would you do this if your nose is not enclosed within the mask?
And also so that water doesn't go up your nose. And mouth (it doesn't taste good).
Equipment changes depending on the location of the dive and purpose. Basic equipment include, wetsuit, fins, snorkel and mask, lead weight, scuba tank, BCD (Buoyancy Compensation Device), and Regulator.
Breathing underwater can be difficult if you do not have the right equipment. A snorkel can help you to breath or you could use a scuba diving mask with oxygen.
They don't breathe normally on their own.They have to use pressure regulators to breathe naturally, overcoming the extreme pressure deep underwater.A snorkel and oxygen tank help the divers breathe when they are underwater.
Many people use a SCUBA suit for diving. Sport divers, police divers and some Navy recovery divers.
They can't survive without oxygen but they can survive with an oxygen mask that scuba divers use and with supply of oxygen of course .
Scuba - self contained underwater breathing apparatus
Mask, fins, snorkel, knife, tank, bcd (buoyancy control device), wetsuit, weight belt, regulator, pressure gauge, depth gauge, etc.
water proof ones
scuba divers use pressure meter because the deeper down you go the more pressure builds upAdditiona depth gauge or a dive computer
Scuba Divers use a Sonar to find treasure or a hidden ship.
For oxygen masks for firefighters, scuba divers etc
Snorkel is not a German word, therefore; it has no meaning in German. In English, a snorkel is a tube that swimmers/divers use to breathe underwater. It's part of their diving masks. The English verb to snorkel is the actual act of swimming/diving with the snorkel. To say snorkel in German, the verb is schnorcheln, and the noun is der Schnorchel.