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Dive Charter companies that frequent Jans Tunnel usually anchor up nearer to Kevs Cave. Kevs Cave was named after Kevin Butler. Visiting both of these locations at the same time has become somewhat an expected adventure and added bonus when diving in this region.
As far as Jans Tunnel goes this was named after our own Jan Doak. This area has a low laying ceiling and is only a few metres deep and there is not much life within its hold. In saying this there are some spectacularly fat horse anemones on the southern side. Inside, the cave widens somewhat into a kind of enclosed rockpool with amphitheatre and another exit out under the natural bridge.
This cave turns sharp left with further forks extending from it. The inside of Jan's Tunnel here at the Poor Knights is mostly sheltered, well most of the time. Blue-flippered penguins find a way out of the sea and up the sloping ground that is riddled with bird burrows.
In front of the cave one finds a confusing configuration of peaks and passages, all very interesting, as one can also make a deep dive towards undivable depths, to find rich encrustations and the affable longfinned boarfish. During the dive one will most likely be buzzed by schooling fish.
However, all this pales to a night dive done here. The place is busy with sleeping fish and night predators, all spectacular subjects for underwater photographers.
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