- "Snowy submarine base. Great vertical gameplay."
- — In-game description
Sub Base is a snowy, multi-leveled map, with many large open spaces as well as enclosed buildings and exposed rooftops.
Amid the buildings is a large courtyard-styled area in the middle of the map. Many routes on the map flow into this area, making it a highly-contested area for gunfights. Players on the catwalks fight against enemies approaching through a tunnel as well as an adjacent rooftop.
A large warehouse at one end is used for long-range firefights whereas at the other end, the power station is home to close-quarter battles only.
- If on the SEALs team, the urban Ghillie Suit will be provided, whereas the Spetsnaz receive an Arctic one.
- There is a poster in the building just right of the Russian spawn that shows an AK-47's parts and how to disassemble it.
- Near the Spetsnaz spawn point, there is a DART II Tsunami Warning System.