I think the doc was Leo Holding and Conrad Anker (?) attempting the most difficult step, which they struggled on, but succeeded (not sure how much for dramatic TV effect tho). First impressions were, no way, but then I thought that hard climbing back then, at those standards, was so free of modern equipment and always so ‘on the edge’ by modern standards, that it might be entirely probable and conditions may have changed for the worse. Then, thinking about all the other stuff, unreliable heavy oxygen equipment, clothing, Urvine being young and not a seasoned climber, too much stuff was ultimately working against them. Having climbed extensively and observed in the alps, I’m not even totally convinced about Noel Odells brief observations of two dots moving above the step, being absolute.