[2] Shortly afterward, the aquarium decided to capture a mate for him, and four members of a pod of Bigg's killer whales were caught on March 1, 1970, off the coast of Pedder Bay near Victoria.

Chimo died in 1972, a little over 2 years after her capture; she was originally thought to be albino because of her white colour, but it was later discovered that she had Chediak-Hegashi Syndrome, which made her very susceptible to illness.

In 1973, Sealand captured an older female whale to be Haida's new mate, and named her Nootka II in honour of her predecessor.

In 1977, Dr. Murray Newman, founding director of the aquarium,[3] got a call from Campbell River, B.C., resident William Davis, who claimed he was feeding a sick baby killer whale by hand in the wild.

Newman then called Dr Michael Bigg,[4] head of Marine Mammal Research at the Pacific Biological Station in Nanaimo, B.C.

Sealand, with permission from Bigg and Davis, decided to rescue the baby whale, who they named "Miracle," and take her back to Victoria for emergency care.

On 20 February 1991, Keltie Byrne, a 20-year-old marine biology student and part-time orca trainer, was dragged into the whale pool after a show.

Tilikum, Nootka IV, and Haida II dragged and repeatedly submerged her until she drowned, despite other trainers' efforts to rescue her.