Pula to Athens: The Argonaut Offshore Crossing This is not a leisure cruise. This is a serious, expert-level offshore passage from Pula, Croatia to Sounio, Greece — over 700 NM descending the Adriatic and crossing the Ionian Sea. Designed as an immersive offshore masterclass, this passage will build your confidence and sea miles for the Aegean 600 Regatta or any serious ocean sailing ambition. You will retrace ancient maritime routes, culminating with an arrival beneath the cliffs of the Temple of Poseidon.