Gardaí are appealing for witnesses to an incident at Portobello Harbour in Dublin 8 on Sunday morning where a 23-year old man "got into difficulty in the canal".
The man was taken to St James Hospital where he remains in critical condition.
He had travelled from Galway to Dublin to attend the All Ireland Hurling Final but had been separated from his friends when the incident occurred.
A man and a woman who came to his assistance are have been encouraged to contact Kevin Street Garda Station.
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Gardaí are anxious to speak with anyone who may have witnessed the incident or who can assist the investigation.
You can contact them at Kevin Street Garda Station on 01-6669400, the Garda Confidential Line 1 800 666 111 or any Garda Station.