The Jakob Maersk is a large shipwreck located off the coast of Porto, Portugal. Resting at depths between 12 and 15 metres, the site is accessible exclusively by boat. Divers encounter mild currents and visibility typically limited to 5 metres, making a dive torch essential for examining the structure's details. Due to the nature of the wreck, there is a risk of entanglement, requiring good buoyancy control. Surface conditions necessitate caution due to boat traffic, and divers should deploy a surface marker buoy before ascending. This site is suited for intermediate divers who are comfortable with low-visibility conditions and wreck navigation.

Porto de Leixões is a shallow reef site located in Porto, Portugal, offering depths between 2 and 7 metres with an average of 5 metres. This site is suitable for beginners, featuring mild currents and accessible entry points from both shore and boat. Divers should be aware of variable visibility, surge, and active boat traffic in the harbour area. Water temperatures range from 14 to 17 degrees Celsius, necessitating appropriate thermal protection. When entering from the shore, exercise caution regarding surf and shore break, and use protective footwear to navigate the shallow rocky areas. Always deploy a delayed surface marker buoy before ascending due to local vessel movements.

Olo is a reef site located along the Costa Verde coastline north of Porto. The reef structure sits at depths between 10 and 20 metres, with an average depth of 15 metres. Conditions are characterised by mild currents and visibility ranging from 5 to 10 metres. Water temperatures remain between 14 and 16 degrees Celsius throughout the year, requiring a thick wetsuit. Access to this site is by boat only. Divers should remain aware of boat traffic at the surface and use a surface marker buoy. The site is suitable for beginner divers, though surf conditions can impact boat operations.

Vila do Porto in Portugal offers a diverse underwater environment featuring a wreck, natural reef, and artificial reef structures. Located 500 metres from the shore, the site sits at a depth of 8 to 12 metres, making it suitable for beginner divers. Divers experience mild currents and visibility ranging from 5 to 10 metres. Water temperatures fluctuate between 14 and 17 degrees Celsius throughout the year. Access is exclusively by boat to avoid surf at the entry point. The site supports night diving, with typical dives lasting 40 minutes. Divers should remain alert for boat traffic during ascents and carry a cutting tool due to the risk of entanglement.

Pelo Negro is a rocky reef located 1500 metres off the coast of Porto, Portugal. This site features a depth range of 8 to 20 metres, with an average depth of 15 metres. Divers must access the reef by boat. Conditions include mild but variable currents and visibility ranging from 5 to 30 metres. The water temperature remains cool, between 14 and 16 degrees Celsius throughout the year, necessitating appropriate thermal protection. Due to active boat traffic on the surface, divers should use a surface marker buoy during ascents. The reef topography consists of sharp, rocky structures requiring careful buoyancy control. This site is suitable for intermediate divers.

Longas is a shore-entry reef dive located in Porto, Portugal. The site features depths ranging from 5 to 12 metres, with an average depth of 8 metres, making it suitable for beginner divers. Visibility is variable, typically between 5 and 15 metres. Divers should be aware of surge, which can affect proximity to the reef, and take care to avoid sea urchins and sharp rock formations. Water temperatures fluctuate between 14 and 17 degrees Celsius throughout the year. The site is accessible for night diving, though conditions such as current and swell vary, requiring careful planning and the use of a surface marker buoy.

Pelo Negro Rocks is a complex rock formation located 500 metres off the coast of Porto, Portugal. This site features a diverse topography of reefs, walls, and canyons with vertical structures reaching up to 4 metres in height. Depths at the site range between 8 and 20 metres. Access is strictly by boat due to the distance from shore and the presence of moderate to strong currents. The water temperature remains cool throughout the year, typically fluctuating between 14C and 16C. Given the challenging current conditions, this site is recommended for advanced divers, though it is also rated for snorkelling.

Praia de Fuzelhas, located near the Siza Vieira tea house in Porto, offers a snorkelling experience defined by a labyrinth of rock formations. The site features deep gullies between these rocks, which provide shelter for marine life and support vibrant algae colonies. Snorkelling is conducted from the shore with depths typically ranging from 1 to 5 metres, averaging 3 metres. Conditions are generally suitable for beginners, though surf is a known hazard. Water temperatures are cool, ranging from 14C to 17C throughout the year. Facilities available at the site include parking, toilets, showers, and a cafe.