[{"data":1,"prerenderedAt":206},["ShallowReactive",2],{"leaderboard-total":3,"spot-seo-the-castle-bicheno":9,"spot-the-castle-bicheno":51},{"entries":4,"total":5,"period":6,"type":7,"generated_at":8},[],0,"all_time","reports","2026-10-03T06:32:05.526386Z",{"title":10,"description":11,"canonical_url":12,"og_image":13,"structured_data":14,"breadcrumbs":44},"Snorkeling Conditions at The Castle (Bicheno) - How's the Spot","Check snorkeling conditions at The Castle (Bicheno), Tasmania. 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This exposed rocky reef drops vertically to 26 metres and is carved with caves, overhangs and narrow cracks to explore. The nutrient-rich Southern Ocean waters attract abundant marine life including massive crayfish, bastard trumpeters and abalone. Accessible only by boat, it's one of Tasmania's east coast underwater highlights.","intermediate","published",{"name":58,"amplitude":74,"phase":90,"latitude":22,"model":106,"epoch":107},[59,60,61,62,63,64,65,66,67,68,69,70,71,72,73],"2N2","J1","K1","K2","M2","M4","MF","MM","N2","O1","P1","Q1","S1","S2","T2",[75,76,77,78,79,80,81,82,83,84,85,86,87,88,89],0.015859031177545363,0.009053640890597533,0.16424657439174412,0.01357063341278078,0.3462991228444328,0.005441561661347435,0.00749702678337942,0.004121280002547368,0.08920753323684312,0.10630246830795208,0.05091987863615415,0.024963602017324296,0.0099478406011915,0.04543077203783122,0.0006323972594852606,[91,92,93,94,95,96,97,98,99,100,101,102,103,104,105],274.4761100191595,331.4781219957147,302.67863557050964,289.3512543075121,311.2345118167871,232.34500585506964,161.65017475554419,170.68714370912033,299.52430770080423,272.7313912390155,296.4470590231482,245.9456479591879,50.0997376605996,314.5085548718846,100.74710266325053,"EOT20","1992-01-01T00:00:00Z",[109,115,120,124],{"name":110,"description":111,"severity":112,"season_start":113,"season_end":114},"Strong surge and swells","Exposed site subject to Southern Ocean swells; surge can be strong through the cave and swim-throughs, especially in rough weather.","warning",5,9,{"name":116,"description":117,"severity":118,"season_start":113,"season_end":119},"Cold water temperatures","Water temperatures average around 16°C in summer and drop significantly in winter; cold-water gear required.","caution",10,{"name":121,"description":122,"severity":112,"season_start":36,"season_end":123},"Limited bottom time on deep sections","The wall drops to 26 m, limiting no-decompression bottom time; careful dive planning essential.",12,{"name":125,"description":126,"severity":118,"season_start":36,"season_end":123},"Restricted visibility in the tunnel","The narrow cave\u002Ftunnel can be silty with reduced visibility; a torch is essential.",{"directions":128,"parking":129,"facilities":130,"fees":133,"access_method":134},"Launch from the Bicheno boat ramp near the town centre or join a charter dive operator in Bicheno. 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