Diving atRoberto Ivens (Portugal)
Off the coast of Portugal, the Roberto Ivens minesweeper presents a compelling destination for divers seeking a challenging historical wreck. This former trawler, pressed into service by the Portuguese Navy during the Great War, rests on a flat sandy bottom at 36 m (118 ft). Its depth and rich history reserve the site for experienced divers. Exploring this significant piece of maritime heritage demands careful planning and appropriate qualifications.
Tonight's objective overview for Roberto Ivens shows an air temperature of 15.1°C. The measured surface conditions include wave heights around 1.46m. This environmental data is logged for the close of the day.
Dive Site Coordinates
38.6303, -9.2704
Key Dive Site Facts
Dive Site Overview
On July 26, 1917, the minesweeper Roberto Ivens sank approximately 4 nautical miles south of the Bugio Lighthouse, at the Tagus river mouth, following a collision with a German mine it failed to detect. Fishermen knew of its presence for many years, but definitive identification as the Roberto Ivens occurred in 2016.
Previously, the shipwreck's location was widely believed to be 12 nautical miles south of Cascais. Now, an inviting recreational dive site allows experienced divers to explore a significant piece of World War I history. Resting on a flat sandy bottom, the wreck lies at an average depth of 32 m (105 ft), reaching a maximum depth of 38 m (125 ft).
Exploration of the remains offers a tangible link to a past conflict, submerged in cool Atlantic waters. Visibility varies depending on conditions, adding to the dynamic nature of the dive.
Best Time to Dive
Diving at Roberto Ivens ideally aligns with Portugal's warmer, drier months, contrasting sharply with the less favorable winter period. Optimal conditions typically run from May through August; average air temperatures during this time range from 18.6°C (65°F) to 23.6°C (74°F). In this peak season, rainfall remains minimal, often less than 1 mm, and wave heights are generally lower, averaging 1.2 to 1.4 meters. These elements contribute to 'Good' dive scores. By comparison, winter months like January and February bring 'Poor' dive scores, with average air temperatures around 13-13.7°C (55-57°F), higher rainfall up to 5.1 mm, and significantly increased wave activity, sometimes exceeding 3 meters. Moderate dive conditions extend into April and from September through November, offering a wider window outside the peak, though with varying degrees of weather stability.
Climate Historical Averages
Monthly records compiled from satellite and marine observation nodes over the last 3 years. Data provided by Open-Meteo and MET Norway.
Dive Experience & Conditions
Mild to strong currents are often present at the Roberto Ivens wreck, creating a dynamic environment that adds to the dive's challenge. Such conditions are a primary reason the site is recommended for more experienced divers. Water temperatures around the wreck typically range from 16°C to 20°C (61-68°F), requiring suitable thermal protection. Resting on a flat sandy bottom, the wreck's average depth is around 32 m (105 ft), with deeper sections reaching the maximum depth of 38 m (125 ft). While specific visibility reports vary, strong currents can sometimes affect clarity. Navigating the wreck in these conditions demands proficient buoyancy control and attentive dive planning.
Dive Difficulty & Safety Guidelines
Approaching the Roberto Ivens site requires acknowledging inherent challenges, primarily its depth and the presence of mild to strong currents. Such conditions necessitate advanced dive training and experience. Divers should be comfortable with deep diving procedures and proficient in managing potential current shifts. Always dive with a reliable buddy and ensure equipment is well-maintained and suitable for technical recreational depths. Given the maximum depth, proper decompression planning and reliable dive computers are essential. Adhering to no-decompression limits or executing planned decompression stops safely is paramount for a successful and safe exploration of this historical wreck.
Recommended Equipment
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Verified equipment recommendations for this dive site are being reviewed and may be added as additional source checks are completed.
Recommended Dive Suit
Water temperatures at Roberto Ivens are currently estimated to be around 16°C (61°F), shaping the overall diving conditions for today. Surface air temperatures are resting at 15°C (59°F).
For the majority of recreational dives here, 5-7mm wetsuit should provide suitable protection. A hood or vest is suggested for sensitive divers due to surface winds. A thermal robe or jacket is recommended between dives.
Environmental conditions are expected to remain consistent in the short-term outlook.
Conditions last reviewed: 18:00 using the latest environmental data.
Dive Logistics & Preparation
Hyperbaric Chamber
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Entry Requirements
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Currency
EUR
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Marine Life at Roberto Ivens
Descending upon the Roberto Ivens wreck reveals diverse marine life that has colonized its structure. Serving as an artificial reef, it has become a habitat for various species, thriving amidst the metal remains. Commonly observed are sea bream, gracefully navigating the structure, alongside wrasses and red mullets. Jewels, octopuses, and conger eels often seek refuge within the wreck's crevices. Additionally, diligent explorers might spot lobsters nestled in rocky areas surrounding the wreck, their antennae protruding from hidden nooks. Though a somber historical artifact, the wreck provides a vibrant ecosystem for these Atlantic inhabitants.
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Frequently Asked Questions
What type of dive site is Roberto Ivens?
Roberto Ivens is a recreational wreck dive site. It features the remains of an old minesweeper that sank during World War I, resting on a sandy bottom.
What is the historical significance of the Roberto Ivens wreck?
A trawler requisitioned by the Portuguese Navy during the Great War, Roberto Ivens sank on July 26, 1917, after colliding with a German mine. Its identity was confirmed in 2016, correcting previous assumptions about its location.
What are the typical depths at the Roberto Ivens dive site?
Diving reveals a flat sandy bottom where the wreck rests at an average depth of 32 m (105 ft). Maximum depth encountered at this site is 38 m (125 ft).
What marine life can be observed around the wreck?
Divers exploring the Roberto Ivens can expect to see a variety of marine life. Commonly sighted species include sea bream, wrasses, red mullets, jewels, octopuses, conger eels, and lobsters taking refuge around the wreck and surrounding rocky areas.
What is the water temperature like at Roberto Ivens?
Water temperatures around the Roberto Ivens wreck generally range from 16°C to 20°C (61-68°F). Appropriate thermal protection is recommended for these conditions.
Are there currents at the Roberto Ivens dive site?
Mild to strong currents are characteristic of the Roberto Ivens site. Such conditions contribute to the dive's challenge, necessitating experience and careful planning.
When is the best time of year to dive Roberto Ivens?
Optimal diving conditions for Roberto Ivens typically occur from May through August, offering 'Good' dive scores with warmer air temperatures, minimal rain, and lower wave heights. Moderate conditions extend into April and from September to November.
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