Cave of the Kastom Shark - Iron Bottom Sound

Gallinazo is rough around the edges, a site that demands respect but gives back in spades. It’s about a 25-minute boat ride from Santa Maria, and you'll want to be ready to drop fast – the sea hits hard here. We’re talking a maximum depth of 13 metres, but don’t let that fool you. This is strictly for advanced divers who are comfortable with quick entries and often challenging conditions. What we love about Gallinazo is the sheer density of the kelp forest. It’s a proper underwater jungle, a sensory overload as the fronds sway, creating these shifting patterns of light and shadow. Visibility averages around 4 metres, which sounds low, but it actually adds to the drama, making every discovery feel more intimate. We've spent hours here just watching Pacific cornetfish ghost through the kelp, their long snouts probing for smaller prey. Look closely on the rocky bottom and you’ll spot Pacific speckled crabs scuttling, while barred pipefish play hide and seek amongst the stalks. It’s a cool, moody dive, completely different from your typical tropical reef, and our pick for something truly unique in Peru.

Location
Iron Bottom Sound, Solomon Islands, Central & South Pacific
Coordinates
-8.341400, 157.501200
Type
cave

Marine Protected Area: Ha'apai

Best Time to Dive in Iron Bottom Sound

The warmest water temperatures in Iron Bottom Sound occur in January, averaging 30.5°C. The coolest conditions are in December at 30.5°C.

Monthly Water Temperatures

  • January: 30.5°C (air: 26.9°C)
  • February: 30.5°C (air: 26.7°C)
  • March: 30.5°C (air: 26.7°C)
  • April: 30.5°C (air: 26.8°C)
  • May: 30.5°C (air: 26.9°C)
  • June: 30.5°C (air: 26.5°C)
  • July: 30.5°C (air: 26.5°C)
  • August: 30.5°C (air: 26.3°C)
  • September: 30.5°C (air: 26.5°C)
  • October: 30.5°C (air: 26.7°C)
  • November: 30.5°C (air: 26.7°C)
  • December: 30.5°C (air: 26.9°C)

Nearby Dive Sites in Iron Bottom Sound

Nearest Dive Centres to Cave of the Kastom Shark

Marine Life in Iron Bottom Sound

Home to 415 recorded species including 320 reef fish, 29 hard corals, 18 sea snails & nudibranchs, 16 sea cucumbers, 7 seagrass & algae, 5 clams & mussels.

Notable Species

Recommended Packing List for Cave of the Kastom Shark

Based on average water temperature of 30.5°C.

  • Shorty or Rashguard - warm 30°C water needs minimal exposure protection
  • 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

Frequently Asked Questions

What is the maximum depth for diving in the Cave of the Kastom Shark?
The maximum depth for diving in the Cave of the Kastom Shark is 32 meters. This makes it a rewarding dive for those comfortable with deeper explorations.
What marine life and underwater features can divers expect to see at the Cave of the Kastom Shark?
Divers at the Cave of the Kastom Shark can expect to explore a fascinating cave environment. The wall inside the cave is home to schools of giant bumphead parrotfish, sharks, and turtles. Keep an eye out for the elusive Pygmy seahorse, which divers sometimes encounter here.
How difficult is the Cave of the Kastom Shark dive, and is it suitable for beginner divers?
The Cave of the Kastom Shark dive is rated as intermediate difficulty. Due to its nature as a cave dive and the depth, it is not typically recommended for beginner divers. Divers should have appropriate experience and certifications for intermediate-level dives.
What is the best time of year to dive the Cave of the Kastom Shark for optimal conditions?
The provided data does not specify the best time of year to dive the Cave of the Kastom Shark for optimal conditions. For general information on diving seasons in the region, you might consult our When to Dive guide.
What scuba diving certifications are required to dive the Cave of the Kastom Shark?
While the data does not explicitly list required certifications, the Cave of the Kastom Shark is rated as an intermediate dive. Divers should possess certifications appropriate for intermediate-level and cave diving environments. Always consult with your dive operator regarding specific certification requirements for this site.
What are the typical currents and visibility conditions like at the Cave of the Kastom Shark dive site?
At the Cave of the Kastom Shark, divers can expect excellent average visibility of 22 meters. The provided data does not include specific information about typical current conditions at this dive site.