The invention provides a conveyance device, suitable for traveling along a surface and conveying an explosive charge, the conveyance device including a propulsion member having two opposite ends, the propulsion member being displaceable between a longitudinally extended position wherein the ends are displaced away from one another; and a longitudinally contracted position wherein the ends are displaced toward one another; an outer gripping member and an inner gripping member, each gripping member being displaceable between a circumferentially expanded position wherein an outer perimeter of the gripping member is displaced away from a center of the member so as to, in use, abut at least part of the surface; and a circumferentially contracted position wherein an outer perimeter of the gripping member is displaced towards the center of the member so as to be spaced apart from the surface; the propulsion member and the gripping members being configured in order for sequential displacement of the propulsion member and gripping members to result in peristaltic displacement of the conveyance device relative to the surface.