Quake II/Research Lab

Level objective
The objective for this level is to locate the repair facility and steal the Commander's head.

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Secrets
This level has one (1) secret, plus a bonus: A.H.D.I.S.S.B.H. bjjc
 * Adjacent the upper end of the transparent Maintenance Bridge there's a cracked bar over a holding cell. Hit it with the Blaster until the bars shatter and jump up into the cell to get a Quad Damage and Slugs from the compartment that has been opened at the back.
 * Bonus — Once you've acquired the Commander's head, just before you leave the Research Lab, note the holding cell window to the right that is now broken open.  Jump into the holding cell and follow the low passageway to the end to observe the following puzzling sequence of characters on the screen: