The Undeep's body contains massive amounts of T-ENG, which are visible in the many sacs along its body. Shooting these sacs will drop large puddles of T-ENG and weaken the Undeep. On the level where you encounter the Undeep, you may be fooled into driving across the plains in a VS. The Undeep quickly destroys your VS and inflicts serious damage upon yourself. Experienced players, however, can sometimes manage to use the VS on the ice field. Tips: You can farm T-ENG from the Akrid in LP1, for the Mission 3 boss fight. On Hard and Extreme mode you will face 2 Undeeps, to make it a better challenge.