Where Natalia has just been captured, you have to get Foster over the lakes and stuff. He says to get into the Uziel because of its jumpjets. He says it's an "advantage" but don't bother. Keep the 'mech you start in and walk through the water.

It's not deep enough to sustain damage from and the first 'mech is more powerful than the Uziel.

Just don't get too close to the VTOL or you'll blow it up and have to restart.