Two pilot whales beached themselves within 8km of each other on the Co Meath coastline.
A whale was discovered on Laytown beach and was assisted back to sea by around 20 people.
They included members of the Boyne Fishermen's Rescue and Recovery Service, The Irish Whale and Dolphin Group, the Defence Forces, Skerries Coast Guard and Skerries RNLI.
A lifeboat made its way to the scene where crew members got into the sea and helped manoeuvre the whale back into deeper water.
The whale was guided back out to sea and prevented from turning back to shore.
Shortly after another whale was found dead on the beach near Mornington.
At first, rescuers believed it was the same whale, but it was later decided it was a different whale.