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deep wading
it takes about 20 minutes to prepare a tank for deep wading. Aside from errection of the air tube, it also requires the crew to seal the tank against any water penetration.
In a fully amphibious IFV this would be designed in, so no preparation would be required. Oxygen for the crew would be in compressed cylinders stored in/on the vehicle, so of course no external detection of the IFV would be possible by observers.
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