LEGO Mindstorms submarine "Grey November"

Steven Canvin challenged us for building "the most intelligent NXT-driven submarine" ... and so I did!

I decided to build a normal hull out of technic beams and placed the NXT as usual inside the structure. But with this submarine I sealed the NXT and the sensors inside a plastic bag.
With this plastic bag I can watch the display and push all the buttons I need ... and the cables I need for motors and sensors are glued in at the seam of the bag to seal it tight ...
There was also an additional cable to the outside to be able to charge the battery!

I built two submarines, Grey November Mark I and Grey November Mark II ...
The first sub is equipped with a compas sensor and a color sensor (for signaling it's state to the outside) and the second one with a compas sensor and an IRseeker.