Repression is an infection map, based around (intended to be played this way, anyways) stealth.
Its really a medium sized hide and seek map, but you die if your found. There are plenty of spots to hide, and you have poor camouflage equipped to make you harder to spot. The Flood has Good Camo equipped, but also has the "Damage Boost" effect on.
Attached are some pictures of the map.