Closed circuit breathing system. Used for stealth missions usually in more shallow waters. The exhaled CO2 is stored in the pouch where its neutralized. No more bubbles. The Seals have to prevent water from entering the mouthpiece. It will react with the chemicals in the pouch and cause the air to become toxic.
Confessions Of A Woman Who Only Chases After US Navy SEALs (Or, Confessions Of A ‘Frog Hog’)
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Details about Hot Toys US NAVY SEAL Water Edge Operation MK43 Gunner 1:6 Scale Boots
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Navy Seal squad behind Bin Laden raid 'training up to take out Kim Jong-un'
US Navy Seals are reportedly training up in case they are called upon for action in North Korea