Four people have scaled a sail of the Sydney Opera House to protest what they say is a "humanitarian crisis" on Manus Island.
The Whisteblower Activist and Citizens Alliance says the climb began just after 10am to highlight "the inhumane treatment on Manus Island of men seeking asylum".
"The Opera House is an iconic symbol of Australian culture and we think Australia is becoming increasingly internationally recognised for its human rights abuse to refugees," WACA spokeswoman Lily Matchett told AAP.
"Australia has become a world leader in cruelty - cruelty endorsed by both Liberal and Labor governments."
