Solo, Duo, Triple and Multiple: minimum 12 continuous hours of swimming in open sea or lake (no pools), with proof of the route and logistics used. Relays: minimum 3 continuous hours, or 10–15 km of prior open-water experience per swimmer.

Minimum sustained speed: 3 km/h. Periodic speed checks in the pool and open water are recommended. For safety, our team may pull from the crossing any swimmer who cannot sustain the minimum speed.

A Medical Certificate with a "FIT" opinion is mandatory (2 months before the crossing for 27K; 3 months before for 54K), and swimmers must disclose any relevant health condition (cardiac, diabetes, etc.): swimmer safety depends on that information.