This is a skill point.
A real pain this one is, one of the more annoying skill points (and trophy) to get in the game. On the level where you are on the orbital station, right at the start (below your ship) is a water area which has many obstacles that will hurt you, such as mines and electric rings. To make things worse, there's a timer counting down until the whole pool gets electrified and killing you instantly, so you can't go slowly. You need to complete the whole section from start to finish without losing any health. The main worry is the rings as they are often closer than they appear. You will eventually get used to how it works though and get the trophy + skill point.