Short answer
Diving tourism in the Azores is well-developed, with numerous dive centers across the islands offering courses, guided dives, and equipment rental. The volcanic landscape creates spectacular underwater topography with caves, arches, and abundant marine life, including groupers, rays, and occasionally sharks. Popular spots include the Formigas Islets and Dori shipwreck. Water temperatures range from 16°C to 24°C, so a wetsuit is recommended. Visibility is often excellent. It's advisable to book in advance, especially in high season, and check certification requirements with local operators.
General information, not legal or tax advice. Rules and amounts change: confirm with official sources.