Black Mesa Hazard Course PRESS ATTACK1 KEY FOR PRIMARY ATTACK PRESS ATTACK2 KEY FOR ALTERNATE ATTACK PRESS RELOAD KEY TO RELOAD AT WILL PRESS AND HOLD YOUR USE KEY HOLD DOWN UNTIL SUIT ARMOR IS CHARGED OR CHARGER IS DEPLETED PRESS YOUR FORWARD KEY AIM WITH THE MOUSE AS YOU SWIM FIND AIR IF YOU BEGIN TO LOSE HEALTH WAIT IN THE AIR UNTIL HEALTH RETURNS TO FORMER LEVEL