The sea, oh the sea,

Roisin Finlay dons her togs, steels herself and takes a dip into the exhausting, exhilarating deep blue world of long-distance open water swimming.

It was about four hours into the swim between Sandycove Island and Kinsale in Cork. I was cold, tired and hungry. Ned [Denison] came over in his crew boat and asked me if I wanted something to eat. When I said yes, he threw a dead fish at me.

This was the experience of Dubliner Ger Kennedy, who took part in Cork Distance week in 2013, the brainchild of Ned Denison. A former ...