The Relay saw swimmers take on a sponsored one-hour swim anytime during the 12-hour event, which started at 7pm and finished the following morning, at the stunning open air swimming centre on Madeira Drive.
It was a great opportunity for the participants to fundraise for the local charity and swim in the pool during the night when it's normally closed to the public.
Amanda Hetherington, Head of Partnerships at Rockinghorse, who took to the water herself at 3am, said:
"It was so wonderful to be able to swim in this glorious pool in the middle of the night. It made it feel really special, and although it wasn't very warm, it felt great to be part of a team of people all swimming for the same cause."
The event was kicked off with pupils from the nearby
Roedean School's swimming team taking to the water.
Then it was time for the other swimmers to take on their challenge, some with colleagues from work and others just for the love of the sport.
Amongst the participants were a team from Galloways accountancy firm who took it in turns to swim several slots during the night.
Gemma Wall, one of their team who together raised £1,740, really enjoyed herself:
"It was an amazing experience – freezing cold but well worth it because it's such a great cause."
Whilst the majority of swimmers took part for an hour, one fundraiser decided to take on the whole 12 hours in half-hour chunks.
Hildi Mitchell is a seasoned swimmer, having recently completed a channel swim, so the idea of swimming for long periods of time outdoors held less fear.
At the end of her swim she said:
"I started at sunset and finished at a beautiful sunrise, and it's been a lovely, lovely night supporting Rockinghorse."