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www.reference.com/article/breathe-underwater-ac86953df2d2871c

A person can breathe underwater by using a snorkel or a scuba tank and regulator. Some people train themselves to hold their breath for long periods of time for freediving. Those who freedive use no external breathing support, but stay underwater for long periods of time.

www.reference.com/article/swim-underwater-5be9a8c6e1a154e0

There are several ways to swim underwater, but a simple and effective way is to use the breaststroke. To perform the breaststroke, extend your arms and legs in a linear fashion. Pull down with your palms as you bring your heel to your rear and kick out, then repeat.

www.reference.com/article/underwater-volcanoes-ec3e010f4aaaf638

One interesting fact about underwater volcanoes is that they deposit about 75 percent of the annual magma output on Earth. The molten magma and hardened lava shape the ocean floor and create the edges of the new plates on the ocean floor.

www.reference.com/article/underwater-volcano-project-4f070daa9a238859

The "underwater volcano" is a common science project meant for children and those new to physics. It is designed to demonstrate how the relative temperature of water creates currents in the ocean.

www.reference.com/pets-animals/frogs-breathe-underwater-15e51fa355e87b54

Adult frogs breathe through the skin when under water. They have thin skin, which has a massive network of blood vessels and capillaries under it. Oxygen enters the frog’s body through the skin and goes into the blood stream, which carries it to the rest of the body. Once the blood cells have rele

www.reference.com/article/penguins-breathe-underwater-d0488d32f28ac188

Penguins are not able to breathe underwater; however, all 17 of the penguin species can hold their breath for as long as 15 minutes. This amazing capability allows them to dive deep within the ocean to find food.

www.reference.com/article/dolphins-breathe-underwater-8f955a0204f9d2f7

Dolphins do not breathe underwater. Before they dive, they take a big breath. They hold it while they are underwater.

www.reference.com/article/purpose-underwater-solar-lights-8840fbd65578b95c

The primary purposes of underwater solar lights are to illuminate areas for enhanced safety, entertainment and aesthetics. The use of solar lights makes many underwater lights safe for use in pools and ponds, where electrical current may not be safe for regular operation.

www.reference.com/article/underwater-welding-schools-f39f1a1f5c7c8005

Underwater welding schools include CDA Technical Institute, National University Polytechnic Institute and Divers Institute of Technology. Schools offering underwater welding programs may also offer additional associated training in related specialties or subspecialties such as maritime welding.

www.reference.com/article/alligators-breathe-underwater-e3a98f6a8525bc7a

Alligators actually don't breathe underwater. Though they can stay submerged for long periods of time, they must eventually surface to breathe through the nostrils on their long snouts.