Arcos do Cruzeiro

Arcos do Cruzeiro is a system of volcanic sea arches off Ponta Delgada, on Sao Miguel's north coast, reached only by boat and split into two separate routes: a shallow arch and a deeper passage, each dived as its own profile. The shallow route runs between 12 and 25 metres, easy enough water for underwater photography. The deeper route drops through a passage running 20 to 30 metres, past black coral fans and large groupers holding station in stronger current than the arch above.

The draw here is the split itself: two distinct dives built around one arch system, a shallow, photogenic profile paired with a deeper, current-swept passage that has its own signature encounter. A diver can work the whole system in one outing, an easy arch swim followed by a more demanding stretch further down.

The shallow route is marketed toward Open Water divers, but book on the depth you can actually work, not the label: confirm your logged experience matches the 25-metre range before committing to either route. Current builds noticeably once you leave the arch and enter the passage, so plan pace and gas for a swim against moving water, not a static reef. Water around Sao Miguel runs coolest through winter, 16 to 17 degrees, and warmest from June to October, up to 23 to 24 degrees, the better stretch for a visit. Azoresdiving and Best Spot Azores both run the site out of Ponta Delgada.