As a result of this accident, I purchased a TruMix 4001 Trimix Analyzer within 24-hours from Dive Gear Express. Additionally, my dive buddies now cross-check gas to labels, and we remove all the tank labels at the end of the dive/dive trip in an effort to prevent a duplication of the error present in this accident. I am content to believe the story about how Carlos died, because all the links of the accident chain are easily assembled, and he was known to have a bit of hubris to accompany his confidence. The sad part is he had a responsibilty to his wife, children, and dive buddies to check that gas. In my opinion, nothing will excuse the fact he didn't know for certain what he was breathing. In this case, I think the police have a clear case of a "death by misadventure". /CaseClosed