The image, which shows the pair as inmates staring moodily past the camera, is a still from the Mikael Håfström prison thriller, which also stars Vinnie Jones, Sam Neill and 50 Cent.
Stallone plays Ray Breslin, a structural security expert who ends up in an 'escape-proof' facility based on one of his own designs after being framed for a crime he didn't commit. While inside, he meets Emil Rottmayer (Schwarzenegger) and the pair plan to escape and track down the true culprit using Breslin's survival skills.
Filmed largely in New Orleans, The Tomb is due for release in 2013. Schwarzenegger and Stallone can also be seen together in The Expendables 2, which hits cinemas on August 16 in the UK and August 17 in the US.
Watch the trailer for The Expendables 2 below: