Circles the submarine's location to take out incoming buzzards. To make this easier, you can land the Avenger on the beach and use a Sea Shark to wait for your partner, effectively avoiding most enemy fire.
Enters the sub, interrogates Bogdan, and inserts a virus into the system. Pro tip: Use an Assault Shotgun and First-Person view for the tight corridors.
To reach the finale, you must complete four main setup missions, each preceded by a free-mode preparation.
One team provides cover while the other enters a foundry to rescue Agent ULP from Russian agents.