Breathing Below One Atmosphere of Pressure?

At sea level, the pressure the air exerts downward is at 1 atmosphere (normally). If you decend 32 feet below water, the water pressure acting on you is 1 atmosphere as well, even greater as you go deeper.

When you try to suck air down underwater, the water is trying to push it back up. At some point, you just wont have enough "sucking power" to over come the weight of the water.

Well, the air is being forced down at one atmosphere of pressure. If the upwards force on it (by the water) is greater than one atmosphere, the air is going to move up, not down and into your lungs. Of course, your lungs do have some power to create a vacuum in the tube and therefore a bit of downward force, so you'll be able to go a little deeper than 33 ft.

The answer is simply NO. Helium MIXED with oxygen, probably 80% - 20%, for combatting "the bends". Helium has no other life-sustaining purpose except that it is far less soluble than nitrogen in the blood. If you're talking about Jupiter, you might first want to determine how deep an atmosphere you're dealing with, and what extreme pressures you'd encounter. Then there's the problem of a "liquid 'metallic' hydrogen" hot zone before you ever get to a rocky core to stand on. I would imagine pressures exceeding that of the deepest parts of the Ocean. Seriously, I'm quite sure that the best scientists and engineers have already ruled on this notion. Remember, "baby steps" first.

its actually 33.4 feet...the first person answered it correctly, just thought id add a bit