Vouliagmeni Lake

Best time to dive

January to December; August

Certification & difficulty

Technical

Snorkelling

Snorkel-friendly - Yes for the general public in the open lake (swimming/snorkeling with paid lake entrance ticket); the cave system itself is scuba-only and off-limits without cave certification.

Safety notes

Overhead cave environment with a single entrance/exit, strong turbulent inflow current, silt-out risk, narrow passages at depth, hydrogen sulfide content, and a documented history of diver fatalities/disappearances (three US military personnel vanished in September 1978, two sets of remains recovered in 1989 by a Greek speleological dive team, and a diver, Panagiotis Tzortzatos, died during an unofficial recovery attempt in November 1990).

Permits & fees

General public pays a lake entrance fee (reported around EUR 17 weekdays / EUR 19 weekends/holidays for 2026 admission); there is no general recreational-diving permit - cave access is gated entirely behind holding a recognized Cavern/Cave/CCR Cave certification and booking directly through the operating technical instructor; the lake is a Natura 2000 site and natural monument, which may add environmental-protection constraints beyond simple ticketing.

Permits and operators change - confirm before booking.

Location

Nearest hub: Vouliagmeni