The Australian Maritime Safety Authority requested Qantas' help last week after a search and rescue aircraft found a raft drifting some 110 miles off the coast of Esperance.
They requested the diversion of the aircraft because there was going to be a gap between when the fixed-wing (rescue) aircraft had to leave the scene and a RAAF Hercules was going to be on scene and they didn't want to lose sight of the life-raft.
Qantas said Flight 475 carrying 226 passengers from Sydney to Perth was briefly diverted to monitor the life-raft. "The Hercules ended up making it there before we did so we weren't required in the end," a Qantas spokeswoman told Australian news outlets.
Three fishermen were later rescued from the life raft.
The Howth Coast Guard Cliff Rescue Team are hosting their second annual 1,500 meter sea swim race for the Dublin Emergency Services this July.