The Marialva is a wreck dive located off the coast of Porto, Portugal. The site reaches depths of up to 24 metres and requires boat access. Divers can expect variable currents and visibility ranging from 10 to 30 metres. The wreck structure presents specific hazards, including potential siltation and overhead environments; entry into swim-throughs should only be attempted by those with appropriate overhead environment training. Water temperatures are cool, consistently between 14 and 16 degrees Celsius, necessitating adequate exposure protection. Species recorded around this area include wrasses, bream, shanny, common sea stars, hermit crabs, European green crabs, and rockpool prawns.

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.

Silver Valley is a wreck site located off the coast of Porto, Portugal, resting at a consistent depth of 14 metres. This site is accessible by boat only and is suited for intermediate divers due to the presence of moderate to strong currents. Divers should maintain good buoyancy control and situational awareness throughout the dive. Given the water temperatures, which range from 14 to 17 degrees Celsius, adequate thermal protection such as a 7mm wetsuit is essential. Divers are advised to time their descent around slack water and use a surface marker buoy to remain visible to boat traffic.

Charneca is a wreck dive located 1500 metres off the coast north of Porto. The site sits at an average depth of 14 metres, with a maximum depth of 15 metres. Access is by boat only. Divers should expect visibility of approximately 5 metres and mild currents, though conditions can strengthen. The wreck presents hazards including entanglement risks and overhead environments; proper training is required for any penetration. Due to water temperatures ranging between 14 and 17 degrees Celsius, a minimum 5mm wetsuit is recommended. Typical dive duration is 30 minutes. Always check locally for current boat operator availability and site conditions before planning a dive.

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.

Draga da Madalena is a wreck site located off the coast of Porto, Portugal. The wreck rests at depths reaching 21 metres, with an average depth of 16 metres. Access to this site is strictly by boat. Divers and snorkellers should be prepared for moderate currents and variable visibility, which can occasionally be low. Due to the nature of the artificial reef structure, divers must be cautious of entanglement risks and are advised to use a surface marker buoy to alert passing boat traffic. The site is suitable for beginners, though conditions require careful monitoring. Night diving is permitted at this location.

The Barcaça wreck is a shallow dive site located in Porto, Portugal, resting at a consistent depth of 10 metres. This site serves as an accessible wreck dive for open water certified divers, though it requires careful planning due to variable visibility and a moderate current. Divers can access the wreck via boat or shore entry. Given the water temperatures ranging from 14 to 17 degrees Celsius, a wetsuit is necessary. The site features structure that attracts temperate reef fish and invertebrates. Because of active boat traffic in the area, the use of a surface marker buoy is essential for safety during the typical 30-minute dive.

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.