An Aatox chemical delivery system was a specialized type of canister, used to contain and disperse chemical substances, namely, Sentox VX nerve gas during Day 5. The system comprised of a metal, cylinder-shaped casing (exactly 5mm thick) which housed the canister, as well as a remote trigger which activated the canister's dispersal mechanism. The trigger was activated by a seven-digit code, unique to each system. ("Day 5: 1:00pm-2:00pm")