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

Dear Ramy, I too thought that since many instructors do not own their own glider their experience might be limited to take off landing and basic pattern work. Well, that is not true. Not all instructors are created equally. I am licensed to fly everything except hot air balloons and blimps, I have always been able to find an instructor to teach me something new. When I first started to fly the Minden area I took a five hour session with Carl Herold (I do not remember if he was a licensed instructor, but that was not important). Want to learn about ridge flying book a flight with Tom Knauff, at least 13 years ago you could. I took my commercial helicopter check ride with Boeing's chief test pilot. If you want to learn you can ALWAYS find someone better and more experienced than you. One post commented that instruction was for inexperienced (I might be paraphrasing or worse mis-paraphrasing) but I respectfully disagree. I have 7,500 hours in everything from open cockpit biplanes to WWII fighters, gliders, jets. I continually train in whatever I fly. Yes, a few times I did not learn as much as I wanted, but that did not make me stop seeking out the more experienced. I took a very expensive mountain flying class in helicopters and ended up teaching the instructors much, so I got them to comp me a day in the water dunk tank.

To keep expanding the thread there are many more items to think about. What is the terrain like? Lots of ways this can play out depending upon the sounding but there is no way to determine the thickness of the cloud layer. Might set up a perfectly good, stable, and safe descent only to fly it right into the ground. The spiral might allow drifting back into the downward side of the wave and the descent rate will go way up; be prepared for strange instrument readings. The pilot won't know how they will react to unusual and frightening operations. Most people don't fly much wave and make a trip to grab a diamond and tend to go since they just have this weekend of camp to make it.

In general, the OP scenario can be avoided by checking the soundings for the predicted wx during the flight. I know, the forecast can be wrong but taking a look and preparing for the potential can't hurt either. If the trend is the DP and temp getting closer as the day goes on the chance of getting closed in go up. The scenario an be avoided by seeing what the local pilots might do as local knowledge is very valuable. If the wx looks iffy, stay on the ground or change the flight plan. No flight ever has to be made.

On Thursday, April 9, 2015 at 12:14:19 AM UTC-4, Ramy wrote:
True, but nothing wrong with expanding the discussion

I'm not objecting to that. I'm objecting to people taking answers to specific questions out of the original context and complaining that the answers are no longer correct.

-Evan