Marine experts have given up hope of rescuing more than 150 false killer whales that stranded on a remote beach on Australia’s island state of Tasmania.

Australian wildlife officers have made the difficult decision to euthanize 90 false killer whales stranded on a remote beach in Tasmania, after rough ocean conditions made it impossible to refloat them.

In a struggle for survival, the heartbreaking sounds of the mammals’ labored breathing and faint high-pitched cries for help echo in a distressing video filmed Tuesday.