First go to tank containg the Reaper and 3 head crabs and fire at second control panel to left with the 'Shock gauntlets' a scientist with a pink tie will shout "What is that thing doing
it might have shorted out the whole system,get that thing back in its cage immeidiatly!" 2 scientist will then drag you back to your cage but you should slash to stop them, now follow the signs to the morgue, you are there you will see a scientist being attacked by a reaper and a security guard trying to shoot the 3 head crabs don't interveine as the security guard will miss all the head crabs and shoot control panel (stand well away as it will expode killing the security guard and the head crabs) then you will notice a morgue draw slightly open slash it and a disected alien will fall out feed off of it and this will give you full health and acid armour and infinite acid spit.