Christmas Island, Australia

    Perpendicular Wall

    Best months: May–Sep

    Why dive here

    With 108+ marine species recorded in the area - including barracuda, blacktip reef sharks, grey reef sharks, manta rays and mobula rays (devil rays) - Perpendicular Wall offers some of Christmas Island's richest wall diving. Water ranges 27-29°C, warmest February, March, April.

    Best timeMay–Sep
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBarracuda, Blacktip Reef Sharks, Grey Reef Sharks, Manta Rays and Mobula Rays (Devil Rays) · 108+ species recorded
    Water27-29°C · warmest February, March, April
    CharacterWall dive
    StandoutRich in charismatic marine life

    Perpendicular Wall on Christmas Island is exactly what it sounds like – a sheer drop, plummeting from about five metres down into the darkness. We love drift diving this one, just letting the current push us gently along. Below that initial shelf, the wall itself is stunning, particularly the vibrant pinks and purples of the Alveopora corals, dotted with tiny Pink Squirrelfish sheltering in crevices. Keep an eye out for the Cocos Angelfish here, they’re a favourite. Our favourite time to visit is during the whale shark season, roughly November to April. Even without the big animals, though, the sheer scale of the wall is humbling. You’ll feel a sense of immense depth here, often seeing large pelagics like silvertip sharks cruising by in the blue. This dive is perfect for anyone who loves dramatic topography and the thrill of a deep blue encounter, and it’s surprisingly accessible given the ease of the drift. Just be mindful of your depth – it’s easy to get mesmerised and go a little deeper than planned.

    Safety Notes

    Strong currents typical this month (avg 33 cm/s). Good buoyancy control essential.

    Today05:3617:5412h 17m daylightGolden hour 17:26

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    Conditions

    Ocean conditions, forecast and tides for Perpendicular Wall

    Perpendicular Wall Ocean Conditions

    Monthly averages for Perpendicular Wall, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (-10.45, 105.65) (0km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    27°C

    81°F · Range: 25.6–28.3°C

    Current Speed

    32.89 cm/s

    Direction: W (289.5°)

    Chlorophyll-a

    0.213 mg/m³

    Clear water

    Salinity

    34.19 PSU

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)

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