US Navy SEALs. They travel to Virginia to carry out "simulated" Navy SEAL training with some former US Navy SEALs, whose beach-based challenges from long beach runs to "surf torture" leave them physically and emotionally drained. After the first day Carla suffers from dehydration and exhaustion, but must face her fear of water in a drownproofing challenge where the volunteers repeatedly sink in a pool with their ankles and wrists bound.
