Perhaps you're thinking of Vostok? I thought much the same when I saw it in the Science Museum in London (just last weekend). Some kind of heat resistant cork o

Perhaps you're thinking of Vostok? I thought much the same when I saw it in the Science Museum in London (just last weekend). Some kind of heat resistant cork or something? http://www.sciencemuseum.org.uk/ImageHandler.ashx?image={4D8D3C65-0821-4FF3-A31B-07FB36C27418}&height=392&width=800&crop=true http://www.sciencemuseum.org.uk/ImageHandler.ashx?image={4D8... I can heartily recommend the Cosmonaughts exhibition if you're at all interested in the birth of the Space Age. It's open till the 12th of March: http://www.sciencemuseum.org.uk/visitmuseum/Plan_your_visit/exhibitions/cosmonauts http://www.sciencemuseum.org.uk/visitmuseum/Plan_your_visit/...