Tests were performed on two captive seals at the Vancouver B.C. Aquarium to examine threshold responses to an underwater electrical barrier. Under close scrutiny by marine mammal physiologists and veterinarians, each animal (tested independently) stopped at mid-pool and would not go near the end of the pool with electrodes once the field was activated. "One animal was deterred four times and the other was deterred eighteen times; they wanted nothing to do with the electrified end", noted SRI Senior Scientist Carl Burger. After the power was deactivated, both seals resumed normal activities within the full span of the pool.