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To add to that, in 4 foot of water: With less than 1.72 psi you would take in water. With 1.72 psi you would not take in water. But no bubbles. With greater than 1.72 psi you would begin to see bubbles. The more pressure the more bubbles. We use a "bubbler system" to measure liquid levels...

One foot of water is about .43 psi. To over come 4 foot of water you would need more than 1.72 psi. Muddy water would have a higher specific gravity than clean water so the conversion to psi would be higher.