Alaska, United States

    Alarm Rocks

    Good diving all year

    Why dive here

    With 58+ marine species recorded in the area - including blue sharks, blue whales, humpback whales, orcas and seals & sea lions - Alarm Rocks offers some of Alaska's richest wreck diving. Water ranges 5-15°C, warmest July, August, September.

    Best timeYear-round
    WetsuitA drysuit
    Marine lifeBlue Sharks, Blue Whales, Humpback Whales, Orcas and Seals & Sea Lions · 58+ species recorded
    Water5-15°C · warmest July, August, September
    CharacterWreck dive
    StandoutRich in charismatic marine life

    Alarm Rocks, true to its name, is a collection of rocky outcrops in Alaska. We often find good numbers of salmon here, particularly during their runs. Look for Spiny Dogfish patrolling the deeper sections and keep an eye out for California Spot Prawns tucked into crevices. It’s a site best suited for divers who appreciate colder water and an opportunity to spot some unique Pacific Northwest marine life.

    Safety Notes

    Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.

    Cold water this month (avg 11°C). Drysuit or thick wetsuit (7mm+) recommended.

    Today05:5916:5710h 58m daylightGolden hour 16:10

    Alarm Rocks Wreck History

    Vessel Type

    cargo ship

    Cause

    unknown

    The dive site known as 'Brown Brothers' in the Ontario Great Lakes offers a fascinating glimpse into the region's rich maritime past. While records are scarce, the name suggests a historic Great Lakes freighter or schooner. The cold, fresh water of the Great Lakes provides incredible preservation conditions, meaning even centuries-old wooden wrecks can remain astonishingly intact. Divers exploring this site can expect to find a vessel frozen in time, with features like the hull, decking, and perhaps even masts and rigging visible. These wrecks are often protected heritage sites, offering a unique opportunity to dive through a piece of North American history, but requiring careful, responsible diving practices to preserve them for future generations.

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    Conditions

    Ocean conditions, forecast and tides for Alarm Rocks

    Alarm Rocks Ocean Conditions

    Monthly averages for Alarm Rocks, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (57, -135.4) (0km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    11°C

    51°F · Range: 8.5–12.8°C

    Air Temperature

    8°C

    47°F

    Wind Speed

    6.44 m/s

    12.5 knots

    Atmospheric Pressure

    1007.9 hPa

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

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