Constanta combines an accessible Romanian Black Sea city break with genuine local scuba instruction, shallow shore-dive leads and operator-advertised day-boat or wreck excursions. SSI-listed dive centers and an independent Casino reef description support the local diving proposition. This is not a verified dive-liveaboard route and not a guarantee that any named wreck is currently open. Expect seasonal sea temperature and visibility, possible cold thermoclines and weather-related cancellations. Snorkel training and advertised snorkeling tours are separate from unconfirmed dedicated sea freediving. Non-divers have the restored Constanta Casino, archaeology, museums and Mamaia beach. The most practical mixed trip is June to September; ask a licensed center to confirm actual sites, certificates, water conditions, rescue capability and departures before traveling.