I know a guy who survived a post fire crash in an R22. It wasn't the fuel tanks that broke or split, but that the fuel cap came off. He was dressed in full Nomex and a helmet. He has an incredible spirit, but is very disfigured.
I remember we went to HAI in Vegas and he came with us. A group of us were sitting in a hotel room talking about dumb stuff we had done and he walked in in just his underwear and told us to never fool around in helicopters. Point taken. A very sobering sight. It's interesting looking at his arms because where his flight suit doubled over his gloves he received no burns at all.
It's very interesting talking to him about the accident. He remembers lying on his side after the crash and as he climbed out he remembers seeing his helmet visor dripping down infront of his eyes as it melted. The other guy who was with him survived the crash and fire, but died later of his injuries. He wasn't wearing Nomex or a helmet.