So they launch Snake and Otacon's robot turkey onto Liquid Ocelot's death submarine.

Snake goes through, getting his ass handed to him by supersoldiers and Metal Gears, while the robot turns invisible and sneaks past everything. The robot is also the only thing capable of unlocking doors, and can also electrocute enemies, on top of being able to actually complete the objective of the mission, which Snake can't because he is not a robot. Once you get to the ridiculous MICROWAVE HALLWAYYYYY you start to realize Snake should have just stayed home for the whole dumb thing.