Moonray Studios have announced a co-op mode will be coming to their underwater game - which you can pick up on Steam right now.
"You and a friend are trapped together, yet still somehow alone. An unconventional narrative co-op game set in a surreal frozen seascape. Developed over 3 years, this first-person co-op story takes place in a surreal sunken world locked between ice and rock. Following an accident, players must scramble to find power, defeat strange creatures and decipher what mysterious forces are attempting to prevent their escape. Debris is designed based on the challenges facing those affected by psychosis and created with the help of medical professionals, Debris explores the interplay between perception and reality in an unconventional narrative-driven co-op format."