[Ronaldus Magnus]

He should have used a wet vacuum.

I'm not sure that a wet vac could provide enough pressure to get the necessary flow rate of compressed air at the bottom of the hose, but you have the right idea that the air needs to be pumped down.

[Graybeard58]

I'm not sure that a wet vac could provide enough pressure to get the necessary flow rate of compressed air at the bottom of the hose, but you have the right idea that the air needs to be pumped down.

Nah, you got it all wrong. Use the wet vac to vacuum all the water from the lake and then find your lost keys.

[Cultural Jihad]

Apart from the issue of pressure, he must have thought he had the lung capacity to easily breathe fresh air through 30 feet of hose.