I asked around at the time out of curiosity but none one knew & or was willing to say what was behind those seriously locked doors. All I recall these days (as it was 40 years ago now) is that the doors where large, heavy in construction & had plenty of red sign on them, red meaning danger! It was a damp dark creepy place under the airport with dripping water everywhere &pipes going in all directions, the airport was built on top of a creek! EPA these days would have a fit! If ya hated ya boss you could hide him out of sight out of mind for decades down there !:-) I took my now ex wife down there one W/E back in the days before security was out of control & you could wander around the tarmac etc in thongs!!!, she hated it, hated the rats that ran between her feet, typical girl...heheh