On Saturday at Kingston Beach Ben Campbell-MacDonald dived into the chilly waters of Lake Wakatipu and began swimming.
It was 8.45 in the morning. He would crawl from the lake in darkness the following morning after 18.5 hours of continuous swimming.
Ben Campbell-MacDonald became the first person to ever swim the length of Lake Wakatipu - our longest lake, at 81 kilometes long.
That is like swimming from Rotorua to Taupo - from Wellington to Martinborough (and a bit more). From Auckland to Wellsford. Akaroa to Christchurch. Non-stop. In one of our coldest lakes.
This is a feat which long distance swimmers are hailing as one of this country's great sporting achievements.
Watch the video