If I were in a place with poor viz, where it would be easy to blunder into the wreck without intending it, AND I had the appropriate equipment with me, AND my general search had not turned up my buddy, I might look inside the wreck. I have the training to do so safely, and the training to retrieve a distressed buddy if the need be.
The thought of an overhead-untrained diver trying to penetrate a wreck to look for someone who, if he is in inside, is probably frantic, short on gas, or incapacitated, gives me the shudders.
If my buddy and I have agreed that we will not enter the wreck, and the viz is good enough that one would not wander in inadvertently, I'd be very unlikely to do a penetration in search, unless there were clear and compelling evidence that the missing buddy were inside. In that case, I'd use my overhead training to take a look, and if I found said buddy inside the wreck, I would try to escort him safely to the surface, and then I probably would never dive with him again.
The thought of an overhead-untrained diver trying to penetrate a wreck to look for someone who, if he is in inside, is probably frantic, short on gas, or incapacitated, gives me the shudders.
If my buddy and I have agreed that we will not enter the wreck, and the viz is good enough that one would not wander in inadvertently, I'd be very unlikely to do a penetration in search, unless there were clear and compelling evidence that the missing buddy were inside. In that case, I'd use my overhead training to take a look, and if I found said buddy inside the wreck, I would try to escort him safely to the surface, and then I probably would never dive with him again.