Freediving Boss 400 Wreck

Key Summary 

• Overview of the BOS 400 wreck, a well-known dive site on the Atlantic Seaboard 

• Detailed description of the wreck’s history and diving conditions 

• Marine life and underwater landscape surrounding the wreck 

• Best times and conditions for diving 

• Safety tips and considerations, particularly due to the instability of the wreck 

• Gear recommendations (without spearfishing gear due to the protected area regulations) 

• Personal anecdotes and expert advice from seasoned divers 

The BOS 400 Wreck Dive Site 

The BOS 400 wreck, located off the rugged coastline near Sandy Bay, is a fascinating yet dangerous dive site. This French crane barge was wrecked in 1994 during a salvage operation, becoming one of the largest and most striking wrecks on the South African coast. The BOS 400 is situated within a Marine Protected Area (MPA), which means that no spearfishing or removal of marine life is permitted. Although the wreck has drawn divers for years due to its massive crane and the eerie sight of its sunken structure, it has now become unstable and poses significant risks. The wreck is considered too dangerous to explore closely, and divers are warned to keep a safe distance from this site, as parts of the structure may collapse at any moment. 

 

History of the BOS 400 

The BOS 400 was a massive floating crane barge that was being towed from Pointe-Noire, Republic of Congo, to Cape Town when disaster struck in rough seas. The towline broke during a storm, and the barge drifted towards the rocky coastline near Hout Bay. Without any propulsion of its own, the BOS 400 slammed into the rocks and was left stranded. Over the years, the wreck has remained in its final resting place, slowly deteriorating due to the harsh marine environment. 

While the BOS 400 was once an iconic dive site for wreck enthusiasts, the structure has weakened considerably. No diver is allowed on the wreck itself due to its instability, and it is considered one of the most dangerous wrecks on the Atlantic Seaboard. 

Getting to the BOS 400 Wreck 

The BOS 400 wreck is located off the coast of Sandy Bay, between Llandudno and Hout Bay. Reaching the site requires a boat, as it is inaccessible from shore. Most dive charters from Hout Bay can provide transportation to the site. The wreck is visible above the water, making it an impressive sight from both above and below the surface. 

Location:

Diving Conditions at the BOS 400 Wreck 

The wreck lies in relatively shallow water, with depths ranging from 8 to 30 meters. Despite its dangerous condition, it remains a popular site due to the sheer size and scale of the wreck. The barge is over 100 meters long, and the giant crane that was once its main feature is still visible above the water. Below the surface, the wreck is surrounded by jagged rocks, kelp forests, and vibrant marine life. 

• Shallow Areas: Parts of the wreck protrude above the surface, and the surrounding waters offer a shallow dive of around 8-10 meters, ideal for viewing the remains of the barge from a distance. 

• Mid-Depth Areas: The deeper parts of the wreck reach around 30 meters, where divers can explore the surrounding rocky seafloor, keeping a safe distance from the wreck. 

• Deeper Sections: At the base of the wreck, debris has scattered across the seabed, adding to the wreck’s haunting appeal. 

Visibility at the BOS 400 wreck can vary greatly, typically ranging from 5 to 15 meters, depending on weather and ocean conditions. The area is prone to strong currents and rough seas, making it more suitable for experienced divers who are comfortable navigating challenging conditions. 

 

Marine Life at the BOS 400 Wreck 

Although the BOS 400 is now too dangerous to explore up close, it has become an artificial reef, attracting a variety of marine life: 

• Cape Hottentot:
  

  
  Frequently seen in the area. 

• Shy Sharks and Pajama Sharks:
  
  Commonly found around the wreck and kelp forests. 

• Klipfish:
  

  
  Often seen among the rocks and wreck debris. 

• Crayfish:
  

  
  Hiding in the cracks and crevices formed by the wreckage. 

• Kelp Forests:
  

  
  The surrounding kelp provides shelter for smaller fish and invertebrates. 

The wreck, being within a Marine Protected Area, supports a rich and diverse ecosystem. Divers can enjoy observing the marine life while respecting the no-take regulations that protect the site. 

Best Times and Conditions for Diving 

The best time to dive at the BOS 400 wreck is during the summer months, when the southeasterly winds clear the water, improving visibility. Winter storms and the harsh Atlantic conditions can make the site difficult to access, and visibility may drop significantly. Water temperatures in the area typically range between 8 and 14°C, so divers should come prepared with the appropriate thermal protection. 

 

Safety Tips for Diving at the BOS 400 Wreck 

Given the unstable nature of the wreck, safety is the top priority when diving at the BOS 400: 

• Do Not Enter or Climb the Wreck: The BOS 400 has deteriorated significantly, and entering or climbing onto the wreck is strictly prohibited due to the risk of collapse. 

• Maintain a Safe Distance: Divers should keep a safe distance from the wreck, as parts of the structure could collapse without warning. 

• Dive with a Buddy: As always, never dive alone. The challenging conditions around the wreck make it essential to dive with a partner. 

• Check Weather Conditions: The site is exposed to strong swells and currents, so always check weather and ocean conditions before planning a dive. 

• Use Proper Gear: Cold water and challenging conditions demand a thick wetsuit (5mm or more), a reliable dive light for navigating the wreck’s surroundings, and fins suited to strong currents. 

 

Gear Recommendations 

For a successful and safe dive at the BOS 400 wreck, consider the following gear: 

• Wetsuits: A 5mm wetsuit with an integrated hood is essential for the cold Atlantic waters, where temperatures can drop to 8°C. 

• Fins: High-performance fins are necessary to navigate the strong currents and help propel through kelp forests. 

• Masks and Snorkels: Low-volume masks ensure optimal visibility in the often murky waters. 

• Weightbelts: Freedivers silicone weightbelts with 800g D-weights provide excellent buoyancy control. 

• Dive Lights: A strong dive light is crucial for illuminating the darker areas around the wreck and enhancing visibility underwater. 

Personal Anecdotes and Expert Advice 

Experienced divers often refer to the BOS 400 as a “must-see from a distance” due to the size and scale of the wreck. The eerie sight of the massive crane jutting out of the water is a reminder of the wreck’s tragic history. However, it’s important to heed the warnings and avoid getting too close to the wreck. Many divers find that the surrounding marine life and the kelp forests are just as rewarding as the wreck itself. 

Conclusion 

The BOS 400 wreck is a haunting and historic dive site on the Atlantic Seaboard, offering a glimpse into Cape Town’s maritime history. Although the wreck is unstable and dangerous to approach closely, it remains a popular dive spot due to its massive structure and the thriving marine life in the area. Divers are advised to maintain a safe distance from the wreck and follow all safety guidelines to ensure an enjoyable and secure experience.