John van Wisse was on pace to break the record for the London-to-Paris ultra-triathlon when he and his support team were stopped by United Kingdom border patrol officers in Dover after they received a call about illegal immigrants coming to the beach.
The police quickly realized their mistake and sent van Wisse on his way to complete the swimming portion of what is known as the "Arch to Arc" challenge, as it begins at London's Marble Arch and ends at Paris' Arc de Triomphe.
The Guardian reports only 13 people have completed the feat and van Wisse is still on track to break the record set by England's Mark Bayliss in 2012.
GALLERY: UNDERWATER PORTRAITS OF ATHLETES
- Brendan Maloy