Following the OZ 777 crash at SFO I came across a thought that I never before have pondered about.
I assume that there's plenty of fuel in the tanks of that airplane, or at least a significant amount of it. How does the investigators deal with this? I guess they do some investigation on site and need to be assured of their safety meanwhile. At some point the wreckage is moved to a hangar for further analysis. I can't think they want to bring fuel tanks not emptied or somehow neutralized into the hangars.
How does it work? Do they try to drain the tanks? I guess they also want to do as little as possible that might affect the parts thus preventing the investigators from discovering things relevant to the investigation.