aircraft?
I keep on the surface until the plane is 5 miles out and submerge in a leisurely manner until they pass. In practice I dive to 100' for four minutes, come to radar depth to check out the situation, if the plane is now moving away (it is), I surface and continue on my way. I never see planes. I detect them on radar.
It's very important that they don't see you or they call in their buddies and have a party at your expense.
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