Gaspard shares his food parcel with the four and gains their confidence sufficiently for them to reveal their escape plan: digging a hole through the floor to reach the underground passages. The bulk of the film then focuses upon their gradual progress, which results in two men reaching an outer manhole in the public street outside the prison walls. However, the two do not escape, and instead return to the cell to organise the timing of the group escape. Geo decides not to join.