[{"data":1,"prerenderedAt":198},["ShallowReactive",2],{"leaderboard-total":3,"spot-seo-double-decker-cave":9,"spot-double-decker-cave":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 Double Decker Cave - How's the Spot","Check snorkeling conditions at Double Decker Cave, New South Wales. Fair conditions, water 18.6°C, waves 0.06m","https:\u002F\u002Fhowsthespot.com\u002Fspots\u002Fdouble-decker-cave","https:\u002F\u002Fhowsthespot.com\u002Fog-default.png",[15,28],{"@context":16,"@type":17,"name":18,"description":19,"url":12,"geo":20,"address":24},"https:\u002F\u002Fschema.org","Place","Double Decker Cave","Double Decker Cave is a spectacular two-tiered sea cave and swim-through located off the southern headland of Jervis Bay on the NSW South Coast. Part of the renowned \"Docks\" dive site, this unique...",{"@type":21,"latitude":22,"longitude":23},"GeoCoordinates",-35.025,150.775,{"@type":25,"addressRegion":26,"addressCountry":27},"PostalAddress","New South Wales","Australia",{"@context":16,"@type":29,"name":30,"description":11,"url":12,"breadcrumb":31},"WebPage","Snorkeling Conditions at Double Decker Cave",{"@context":16,"@type":32,"itemListElement":33},"BreadcrumbList",[34,39,42],{"@type":35,"position":36,"name":37,"item":38},"ListItem",1,"Home","https:\u002F\u002Fhowsthespot.com",{"@type":35,"position":40,"name":26,"item":41},2,"https:\u002F\u002Fhowsthespot.com\u002Fexplore?region=new-south-wales",{"@type":35,"position":43,"name":18,"item":12},3,[45,47,49],{"label":37,"href":46},"\u002F",{"label":26,"href":48},"\u002Fexplore?region=new-south-wales",{"label":18,"href":50},"\u002Fspots\u002Fdouble-decker-cave",{"id":52,"name":18,"slug":53,"latitude":22,"longitude":23,"description":54,"difficulty":55,"image_url":56,"status":57,"tide_constituents":58,"hazard_entries":109,"access_info_structured":136,"area_boundary":56,"routes":56,"created_at":144,"updated_at":145,"today_conditions":146,"today_verdict_view":168,"images":194,"submitted_by":195,"region_name":26,"verification_status":197,"verified_at":56,"disputed":164,"verifier_count":5,"last_verified_display_name":56},"c1169e4a-c2c4-4639-83c9-1bd0b25dbc39","double-decker-cave","Double Decker Cave is a spectacular two-tiered sea cave and swim-through located off the southern headland of Jervis Bay on the NSW South Coast. Part of the renowned \"Docks\" dive site, this unique sandstone formation features a lower chamber and an upper chamber, allowing snorkellers and divers to glide through both levels. The cave is adorned with vibrant sponge gardens, gorgonian fans, and colourful soft corals clinging to the walls. Inside, shafts of light filter through the entrances, illuminating schools of Old Wives and the occasional elusive Eastern Blue Devil. The site is sheltered from prevailing winds and offers an otherworldly, cathedral-like underwater experience.","intermediate",null,"published",{"name":59,"amplitude":75,"phase":91,"latitude":22,"model":107,"epoch":108},[60,61,62,63,64,65,66,67,68,69,70,71,72,73,74],"2N2","J1","K1","K2","M2","M4","MF","MM","N2","O1","P1","Q1","S1","S2","T2",[76,77,78,79,80,81,82,83,84,85,86,87,88,89,90],0.02118736429273115,0.008373287317978048,0.16505622850306137,0.03915139496961739,0.47968610607166057,0.0030855873277364884,0.0014167234723208668,0.008804654059727308,0.10889423875063602,0.09174600082722836,0.05235238336471259,0.017470273779407134,0.004442734110913625,0.10555070510769594,0.004419397341682467,[92,93,94,95,96,97,98,99,100,101,102,103,104,105,106],271.8873991932603,6.815660467915921,323.74623161720507,315.19449688458616,308.175030715449,270.39700356246306,94.93227476221098,33.89020669692995,299.1953512457348,290.8730267905519,313.933913097619,282.90804062900264,143.5186438966691,324.9508157900734,347.1663503553176,"EOT20","1992-01-01T00:00:00Z",[110,116,120,123,127,130,133],{"name":111,"description":112,"severity":113,"season_start":114,"season_end":115},"Surge in cave passages","Ocean swell can create strong surge through the cave's narrow swim-through chambers, which can push snorkellers against rocks.","warning",5,8,{"name":117,"description":118,"severity":119,"season_start":56,"season_end":56},"Boat traffic","The site is accessed by boat and is near the main Jervis Bay shipping channel; be aware of vessel movements on the surface.","caution",{"name":121,"description":122,"severity":119,"season_start":56,"season_end":56},"Variable visibility","Wind and swell can stir up sediment, reducing visibility significantly — the site is best in calm conditions.",{"name":124,"description":125,"severity":119,"season_start":114,"season_end":126},"Cold water thermocline","Temperate NSW waters can have sharp thermoclines; water temps may drop suddenly in deeper sections (12-18°C in winter).",9,{"name":128,"description":129,"severity":113,"season_start":56,"season_end":56},"Confined spaces \u002F cavern","The vertical swim-through leads into a cavern with limited exit options. Not suitable for those uncomfortable with enclosed spaces.",{"name":131,"description":132,"severity":119,"season_start":114,"season_end":126},"Swell surge inside cavern","Swell can push snorkelers\u002Fdivers against walls inside the swim-through and cavern, especially on days with larger ocean swells.",{"name":134,"description":135,"severity":119,"season_start":56,"season_end":56},"Sharp reef edges","The rocky reef surrounding the entrance has sharp edges and sea urchins. Care required when entering and exiting.",{"directions":137,"parking":138,"facilities":139,"fees":142,"access_method":143},"Double Decker Cave is part of The Docks dive site on the southern side of Jervis Bay, near Point Perpendicular. Access is by private boat or commercial charter from the Jervis Bay region (departing from Currarong or Huskisson). The site is approximately 2-3 km offshore from the southern headland. No shore entry is possible — the cave is only accessible via boat.","Parking available at Currarong boat ramp or Huskisson wharf areas, depending on charter operator.",[140,141],"parking","toilets","Charter dive trips typically cost $120–$180 per person. No fees for private boat access.","boat","2026-07-27T02:54:43.173409Z","2026-08-04T05:36:16.070469Z",{"verdict":147,"evaluated_at":148,"models":149},"marginal","2026-10-03T02:19:24.150123Z",[150,157,162],{"model_name":151,"is_favourable":152,"value":153,"threshold":154,"unit":155,"operator":156},"Wind Speed",true,1.42,10,"kn","lte",{"model_name":158,"is_favourable":152,"value":159,"threshold":160,"unit":161,"operator":156},"Wave Height",0.058,0.5,"m",{"model_name":163,"is_favourable":164,"value":165,"threshold":40,"unit":166,"operator":167},"Visibility",false,0.99,"","gte",{"verdict":147,"rating":169,"evaluated_at":148,"generated_at":148,"source":170,"confidence":171,"visibility":174,"parameters":175,"models_passed":43,"models_total":114},"Fair","precomputed",{"level":172,"value":173},"High",100,{"score":165,"rating":56,"confidence":56},[176,178,183,186,191],{"name":158,"value":177,"label":56,"unit":161,"favourable":152,"score":43,"optimal_max":160,"marginal_max":36},0.057999999999999996,{"name":179,"value":180,"label":56,"unit":181,"favourable":164,"score":36,"optimal_max":115,"marginal_max":182},"Swell Period",8.75,"s",12,{"name":151,"value":184,"label":56,"unit":155,"favourable":152,"score":43,"optimal_max":154,"marginal_max":185},1.41511552,15,{"name":187,"value":188,"label":56,"unit":189,"favourable":164,"score":5,"optimal_max":114,"marginal_max":190},"Precipitation",24.3,"mm",20,{"name":192,"value":56,"label":193,"unit":166,"favourable":152,"score":43,"optimal_max":56,"marginal_max":56},"Tidal Phase","slack",[],{"display_name":196},"Daniel","unverified",1791009147854]