Ender pointed out the shark logo, so wont mention that...
It seems the code has to be entered every 3 hours or 10800 seconds, 108 being the sum of the numbers,
The logo looks like it has the word "dharma" on it - this means religion or belief.
So i infer from what desmond said the place is an armageddon shelter from some terrible disease which could wipe out humans. Maybe the serum is some kind of protection against this mystery illness?
Oh yeah one thing i forgot to mention: Evangeline Lilly (Kate) crawling through the vents - niiiiice
(you may have to adjust gamma or something)