DivePlnr
    Cave of the Kastom Shark dive site
    cave
    Iron Bottom Sound, Solomon Islands
    Ha'apai

    Cave of the Kastom Shark

    Best months: Jul–Oct

    Protected Area

    Ha'apai

    Why dive here

    With 391+ marine species recorded in the area - including barracuda, blacktip reef sharks, grey reef sharks, humpback whales and orcas - Cave of the Kastom Shark offers some of Iron Bottom Sound's richest cave diving. Water ranges 29-31°C, warmest January, April, December.

    Best timeJul–Oct
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBarracuda, Blacktip Reef Sharks, Grey Reef Sharks, Humpback Whales and Orcas · 391+ species recorded
    Water29-31°C · warmest January, April, December
    CharacterCave dive
    StandoutExceptional marine biodiversity

    Forget everything you think you know about cave diving here. The Cave of the Kastom Shark starts with a quick walk through the mangroves to a small, unassuming pool – your entry point. Below, the cave opens up, revealing a world that feels ancient and undisturbed. We’ve seen impressive schools of rainbowfish here, and the resident banded sea kraits are usually out hunting. It's a proper cave dive, dark in places, but suitable for experienced divers who appreciate something a bit different from the usual reef exploration. You'll likely spot a few small giant clams tucked into crevices, too.

    Safety Notes

    Overhead environment - never enter without proper cave/cavern training, redundant equipment, and a guideline.

    Today06:1018:2512h 15m daylightGolden hour 17:57

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    Conditions

    Ocean conditions, forecast and tides for Cave of the Kastom Shark

    Cave of the Kastom Shark Ocean Conditions

    Monthly averages for Cave of the Kastom Shark, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (-9.03, 159.16) (58km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    30°C

    85°F · Range: 28.7–30.5°C

    Air Temperature

    27°C

    80°F

    Wind Speed

    3.74 m/s

    7.3 knots

    Atmospheric Pressure

    1010.5 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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