The Night She Crossed the Channel

Forty-eight hours before she was due to attempt one of Britain’s most demanding sea swims, Siân Clement faced the kind of setback that could have ended the whole undertaking: her original pilot was no longer available. She later recalled having to find a replacement at the last moment. Yet on 23 July 2016, with Andrew Edwards piloting Big Blue, she set out from Ilfracombe towards the Welsh coast — a crossing no woman had previously completed on that recognised route. [1, 2, 3]

Seven years earlier, Gethin “Geth” Jones had pioneered the Ilfracombe–Swansea swim, taking 21 hours 39 minutes 34 seconds. His achievement had shown what was possible across the long, tide-swept expanse between North Devon and South Wales. Now Siân was following that line of ambition into the Bristol Channel, facing a large spring tide and the uncertainty of an overnight passage. [1, 3]

In an interview published in 2022, Siân remembered thick concentrations of moon jellyfish in the darkness and repeated bouts of sickness. She changed to solid food as the swim unfolded. These details come from her own later account, rather than a reconstructed observer’s log; they give a human dimension to a result that otherwise appears in the record books as little more than a date and a time. [3]

Fourteen hours and one minute after the recognised start, she had completed the Ilfracombe–Swansea route. She was its second recognised solo finisher and its first woman, cutting more than seven and a half hours from the time of the inaugural crossing. A family welcome at Mumbles slipway features in her recollections, although that does not, by itself, establish the exact official shore-touch location. [1, 2, 3]

A Crossing That Became a Larger Story

The Bristol Channel was not Siân’s first major test in open water. On 1 July 2009 she had crossed the English Channel in 12 hours 48 minutes. Her 2016 Bristol swim added a second great channel to her record, but a third — the North Channel between Ireland and Scotland — remained. [2, 5]

Geth Jones was more than a name on the route list. Siân later recalled his encouragement to attempt the North Channel, and said that his death helped prompt her to commit to the challenge. The connection between the two swimmers makes this story more than a succession of records: it is also about the friendships and encouragement that carry marathon swimming from one generation of attempts to the next. [3]

On 10 July 2022, Siân completed the North Channel in 12 hours 45 minutes 32 seconds. With that final crossing she became the first woman to finish the Original Triple Crown — the English, Bristol and North Channels — in a combined swimming time of 39 hours 34 minutes 32 seconds. The Guinness certificates preserved in the archive commemorate both her Bristol Channel performance and that historic three-channel achievement. [2, 5]

The Woman Beyond the Record

Associated with Aberavon, Siân has described balancing sea swimming with her work as a doctor. Her endurance career also includes North Channel relay swimming and an Ironman finish. Those achievements suggest the breadth of her sporting life, though the archive does not yet hold a complete account of her childhood or early training. [3, 6]

The surviving photographs from her separate Glenthorne–Porthcawl swim offer a different glimpse of that life in the water. They do not depict the 2016 Ilfracombe–Swansea crossing, and are presented here as a companion chapter in Siân’s Bristol Channel story rather than as photographs of the record swim.

What the Records Tell Us — and What They Do Not

The Guinness certificate records the 2016 crossing in 14 hours 1 minute. A newly preserved GPS CSV contains 90 location fixes between 00:42:55 and 14:36:58 on 23 July 2016, spanning 13 hours 54 minutes 3 seconds between its first and last samples. That sampling window is not the official swim duration. Nor can a distance calculated between sampled positions be treated as the complete distance she swam. The archive also contains an MSF observation-form scan, although some handwritten details still require careful verification.

Record language changes as a sport develops. Siân was the first woman to complete the Ilfracombe–Swansea route, and the first woman to complete the Original Triple Crown: those historical firsts stand. But Rebecca Lenon recorded 13 hours 52 minutes 47 seconds on the Ilfracombe–Swansea route on 18 July 2026, and Elizabeth Fry later achieved a faster Original Triple Crown aggregate. Siân’s certificates document what she achieved at the time, not an assertion that every time record remains unbroken today. [1, 5]

The most enduring part of her story is therefore not simply a number. It is the last-minute rescue of an ambitious swim, the long night among jellyfish and tidal streams, and a promise of sorts carried forward from Geth Jones to a North Channel finish six years later.

Two Crossings, One Remarkable Swimmer

Above: Siân Clement’s two Bristol Channel crossings — the 2025 Glenthorne–Porthcawl route in blue and the 2016 Ilfracombe–Swansea route in red. Map reproduced from Monster Swims.