Chair Entertainment Group announced that it's Unreal Engine 3-based underwater side shooter, Undertow, will splash onto the Xbox Live Arcade service on Wednesday, November 21.

Ambitiously billed by the developer as an "aquatic action-shooter for up to 16 players that combines the multiplayer of Battlefield with the control and mayhem of Geometry Wars," it also promises that the game will come complete in a 50 MB download (Microsoft's limit for XBLA downloads is 250 MB). The full version promises four unique and upgradeable unit types that players use to kill enemies in their quest to complete the levels.

While 50 MB seems rather "petite," the gameplay trailers look great for a 2-D centric game with 3-D vehicles and detailed explosions in a 16:9 format game. So far, the game's developer and publisher has not announced how much Undertow will cost.