Prejšnji dan me kliče Nikola, hei a greva ta drugo “skrivno” jamo pogledat. Kaj je “skrivna” jama? Jama, ki jo poznajo bolj, kot ne lokalci in je ne najdeš na google mapsih. V razdalji 100m sta praktično dve jami. Nekje sta celo povezani, a precej zadaj. Tokrat sva se podala sama v desno jamo, ki je prekleto zavita in na mestih ozka. Se pa precej mulji. No za enkraten potop vseeno zanimiva, saj je bila pisana. Vmes smo srečali tudi haloklino. Pa kaj pravi chat gtp na to: Haloklina je plast v vodi, kjer se slanost zelo hitro spremeni.
V mehiških jamah in cenotah na polotoku Yucatán nastane zato, ker je zgoraj sladka voda iz dežja, spodaj pa slana morska voda, ki pronica iz morja. Ker je slana voda gostejša, se plasti ne zmešata in med njima nastane jasna haloklina.
V teh jamah je haloklina pogosto zelo izrazita in vidna. Potapljačem izgleda kot zamegljena plast ali valovanje v vodi, včasih celo kot “oblak”. To je posledica lomljenja svetlobe na meji med sladko in slano vodo.
Mehiške jame so poseben primer, ker so globoke, mirne in iz apnenca, zato se plasti dolgo ohranijo brez mešanja. V nekaterih cenotah se ob haloklini pojavi tudi plast vodikovega sulfida, ki še poudari videz “megle”.
Skozi fotke se vidi, kako je potapljač “zameglen” zaradi halokline. V realnosti pa je zelo poslabšan vid, na kar mora biti potapljač še posebno previden. Sam včasih v takih primerih držim vrvico, ki je v jami med prsti, da ne bi zašel. Varnost je prva.
Drugi potop pa sem opravil v 100m odmaknjeni jami. Meni osebno bolj fotogenična, moj tip jame, bel apnenec, in svetla jama. Tokrat s stage, nekaj jumpov, saj sem poizkušal priti do naslednje cenote. Žal nisem še imel zemljevida, sedaj mi je jasno jump, TR, TR in si tam, po 90 minut plavanja v eno smer na 6.5 metrih
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