The Secret Service - 1x07 - Recall To Service- Followmy.tv

The Aquatank, a new computer-controlled military vehicle, is to be demonstrated to the NATO heads of defence at the World Army Experimental Vehicle Division base. Anticipating sabotage, the Bishop assigns Father Unwin and Matthew to check security arrangements at the base, and Matthew is on board the Aquatank when it is re-programmed to target the oberservers' blockhouse!