In wave, in blue hole at cloud level, hole closes, in IMC, then what?

True, but nothing wrong with expanding the discussion to the more realistic scenario of what happened recently (which no doubt inspired the OP to start this thread) while still staying on topic.
And yes, one never stop learning and training, my comment was towards the common remark to take a flight with an instructor, as if instructors always have more experience. Many instructors have more experience in takeoff and landings, but not in soaring, XC, wave and extreem weather.

Ramy