The EMP grenades are primarily used for flushing B.J out of cover and are proven to be quite annoying if the player sticks to one of the side rooms in the arena. Making contact with the grenade itself before explosion can also damage the player. EMP grenades have an approximately 5 second charge time before exploding, damaging the player and draining the Laserkraftwerk. These lasers do relatively high damage on harder difficulties, so it is advised to take cover. Upon detection, the Heavy Robot will fire a barrage of heavy laser fire at B.J before firing an EMP blast almost immediately after. The Heavy Robot in the London Nautica is armed with two attacks laser cannons and EMP grenades. The second appears near the end of the Lunar Base, blowing up a part of the tram the player is escaping on thus disabling it, forcing the player to continue on foot. The first one is encountered at the end of the mission London Nautica, acting as a boss. These bad boys carry Superlaser cannons and have a protective layer of hard steel. The game describes the robots as such these are military grade robots, the state-of-the-art in the field of advanced mechanized unit design.