Abstract: A vehicle has a sacrificial buoyancy structure for attenuating damage to the vehicle body due to an under-vehicle explosion. The vehicle has a primary hull, connector plates disposed along the primary hull, track assemblies mounted to the connector plates, and gussets attaching the connector plates to the primary hull. The connection of the gussets to the primary hull is sacrificial in that a sufficient amount of explosive force detaches the gussets, connector plates and track assemblies from the primary hull, whereby the gussets, connector plates and track assemblies absorb a portion of the explosive force. The vehicle further has cross rods disposed between the connector plates and affixed thereto. The vehicle also has a sacrificial buoyancy hull beneath the primary hull attached to the cross members wherein the buoyancy hull, connector plates and primary hull form an enclosed buoyancy compartment enabling the vehicle to float on water.