In this category the freediver descends along a vertical line using a pair of bi-fins. Use of monofin is prohibited. The freediver can only use the line for guidance and can pull it once at the target depth. The key point is that the diver is not allowed to change his ballast during the dive.
In short: Swimming down and back up using two fins.
AIDA Records
| Category | Depth (m) | Person |
|---|---|---|
| UK Men | 98 | Dean Chaouche |
| UK Women | 75 | Helena Bourdillon |
| World Men | ||
| World Women |