Abstract: An access module for a modular access structure has a longitudinally and vertically extending first frame and a longitudinally and vertically extending second frame. The second frame laterally opposes the first frame. A deformable lower support structure laterally extends between the first and second frames. The lower support structure includes a deck spanning a longitudinal length of the access module. A deformable upper support structure laterally extends between the first and second frames. The upper support structure is spaced above the deck. The access module is configurable by deformation of the lower and upper support structures between an extended configuration in which the first and second frames are spaced apart a first distance and the deck is generally horizontal and a collapsed configuration in which a distance between the first and second frames is less than the first distance. The access module is adapted to be fastened end to end to a second access module.