The organisation hoping to build the facility in eastern Canada say it would be able to attract funding if it received a commitment from the French government to send the two whales there.

The Whale Sanctuary Project (WSP) proposes to close off an area of seawater measuring 40 hectares (98 acres) with nets.

Wikie and Keijo could then use the large expanse of water, with human support from vets and welfare workers, until the end of their lives.

The average lifespan of a male killer whale is about 30 years, according to the US National Oceanic and Atmospheric Administration agency. Females usually live about 50 years.

“Life at the sanctuary will be as close as is possible to what they would have experienced growing up in the ocean,” say the WSP. “It will be a new life that will make up for so much of what went before.”

This kind of project has been done before.

Keiko, the orca that starred in the 1993 move Free Willy, was rescued from captivity in 1996 before being taken to a bay in Iceland in 1998.

Unlike Wikie and Keijo, he was born in the wild and was able to relearn some of the necessary survival skills while living in the bay for four years.

He eventually left with a pod of orcas he had joined and swam to Norway where he died in 2003 following an infection.

Strager warns that the proposed sanctuary might feel as alien to Wikie and Keijo as open ocean would.

“We have this conception that animals enjoy freedom in the same sense we do, ‘now they are free and they will love it.’

“We don’t know if they see freedom the same way … Are they going to be scared because it is so different to what they’re used to? I don’t know.”

She tells the BBC: “I don’t think there are any good solutions for animals that have been kept in captivity their whole lives.”