It's emerged the driver of the car involved in the Buncrana pier tragedy may have been three times over the drink-drive limit.
An inquest into the deaths of five members of the same family in Donegal last year has heard that alcohol may have been a factor.
Sean McGrotty was behind the wheel when his car slid on algae into the water, killing him, his two sons, their grandmother and her daughter.
Pathologist Dr. Catriona Dillon told an inquest that she found 159 milligrams per decimetre of alcohol in Mr McGrotty's blood. The legal limit is 50 milligrams per decimetre.
The pathologist told the inquest she couldn't indicate if the alcohol impaired Mr McGrotty's driving as it depended on a number of factors including whether he was a habitual drinker.
But she said the levels of alcohol found may indicate an element of intoxication involved.
Two witnesses have told how the car was in the water when they arrived on the scene, and had sunk 12 to 15 minutes later.
They described how they could hear screaming from kids in the car, and how Mr McGrotty called for help from the vehicle.
Davitt Walsh, the hero who swam out to the car and saved baby Rionach Ann from the car, also gave evidence.
He described he tried to help a boy escape from a broken window in the car, but lost the grip on his hand when he got stuck as the vehicle sank.
Witnesses have described how there was slippery and thick algae on the slipway in Buncrana that night - and no safety signs were in place.
Three lifebouys were meant to be at the pier, but gardaí say only one was in place that night.
One eyewitness described how three bodies came to the surface of the water shortly after the car sank, with one seeming to attempt to swim to shore.
Gardaí described the efforts made by emergency services to resuscitate people at the scene, with first responders spending 30 minutes trying to save the life of Ruth Daniels in particular.
First responders arrived at the scene within 4 minutes of being notified of the tragedy, but were too late to save any more lives.
The inquest continues this afternoon and is expected to run into tomorrow.