AREFERRO 21 - Mar del Plata

AREFERRO 21 isn't about deep blue adventures or a parade of big pelagics. This is a shallow, surprisingly engaging wreck dive, perfect for a relaxed afternoon. The old lighter vessel lies broken, its metal ribs forming a skeletal outline just beneath the surface. We love tracing the hull's remnants, imagining its working life before it met its end. What really makes AREFERRO 21 special is the way the local marine life has utterly reclaimed it. You'll find a thick carpet of anemones and sponges clinging to every available surface. Look closely, and you'll spot scuttling crabs, shy blennies tucked into crevices, and schools of silversides flickering through the gaps in the wreck. Visibility can be a bit variable here, so we'd suggest picking a calm day, ideally after a few days of settled weather. The best light often hits late morning, illuminating the wreck without too much surface glare. It’s not a challenging dive, but it's a wonderfully atmospheric one.

Location
Mar del Plata, Argentina, South America
Coordinates
-34.471000, -57.610832
Type
wreck
Maximum Depth
5m

Wreck History - AREFERRO 21

Vessel Type
barge
Cause
unknown

The AREFERRO 21 is a classic example of the maritime history hidden just beneath the waves of Mar del Plata. Identified as a lighter vessel-a type of barge used for transferring cargo to and from larger ships-it was a workhorse of the port. Its name, possibly translating to "Argentine Iron 21," points to its role in the industrial life of the harbor. The cause of its sinking is lost to time, but today it rests in just 5 meters of water, a silent monument to the region's commercial past.

This wreck is an underwater playground for divers of all levels. Its extremely shallow depth makes it an ideal spot for training dives, check-out dives, or a relaxed exploration. Classified as a dangerous wreck, it remains a substantial feature on the seabed, providing a complex habitat for marine creatures. Divers can easily navigate the simple, open structure of the barge, searching for the critters that now call the corroded metal home. The AREFERRO 21 is a reminder that even the most functional vessels can become beautiful, life-filled underwater attractions.

Best Time to Dive in Mar del Plata

The warmest water temperatures in Mar del Plata occur in January, averaging 26.7°C. The coolest conditions are in July at 11.0°C.

Monthly Water Temperatures

  • January: 26.7°C
  • February: 25.8°C
  • March: 24.1°C
  • April: 20.3°C
  • May: 16.3°C
  • June: 13.0°C
  • July: 11.0°C
  • August: 12.2°C
  • September: 14.8°C
  • October: 18.2°C
  • November: 22.3°C
  • December: 24.8°C

Nearby Dive Sites in Mar del Plata

Nearest Dive Centres to AREFERRO 21

Marine Life in Mar del Plata

Home to 33 recorded species including 19 reef fish, 7 sharks & rays, 3 whales & dolphins, 2 other, 1 crabs & lobsters, 1 sea snails & nudibranchs.

Notable Species

Recommended Packing List for AREFERRO 21

Based on average water temperature of 19.1°C, currents 3 cm/s.

  • Wetsuit (3-5mm) - comfortable for 19°C water
  • Mask - essential for every dive
  • Fins
  • BCD - buoyancy compensator
  • Regulator - your most safety-critical piece of gear
  • Dive Computer - tracks depth, time, and NDL
  • Surface Marker Buoy (SMB) - essential for boat pickups
  • Dive Torch - useful for crevices and colour at depth
  • Underwater Camera - capture your diving memories