Wow, I am now extremely curious about what the inside of that cave looked like! But I suppose taking pictures of it wouldn't have really served enough practical purpose to deal with hauling something back out of the hole, not the mention the lingering radiation from the previous test would probably instantly expose any film sent down there.

Still! What does the container for a nuclear explosion look like on the inside? Is it smooth and glassy? Does molten material drip down and form stalactites and stalagmites? Does the surface crack as it cools? What color is everything?