This involves finning up and down a swimming pool (or in the sea), to cover a horizontal distance. Physically, it is very demanding. This can either be done in a 25m pool or in a 50m pool. Using a 50m pool is better for this category since fewer turns are necessary which tend to break the rhythm.
In short: swimming as far as possible underwater
AIDA Records
| Category | Distance (m) | Person |
|---|---|---|
| UK Men | 226 | Dave King |
| UK Women | 200 | Alice Hickson |
| World Men | 300 | Mateusz Malina (Poland) |
| World Women | 243 | Magdalena Solich-Talanda (Poland) |