Tremuda SE (2; south entrance)

A subtidal sea cave system consisting of two straight tunnels which join like a T. The E entrance is the bottom of the trunk of the T (see separate entry). Wide enough to turn (>5.5 m) at the crossing place. The tunnel depth at the crossing place is 5.1 m BCD. The bar of the T is roughly parallel to Tremuda Subterraneous Passage (see separate entries) and also leans left (W) by about 20 degrees .

This entrance is very narrow in most of the tidal range. It is navigable (see photo 3) on a 4.4 m or more tide level - but if much more there may will be lack of headroom at the W end of the other tunnel for any through passage.

Links and Resources:

Not noted on OS.
Photo 1 this entrance on the right; bottom obscured by a skerry.. On left is the S entrance to the Tremuda Subterraneous Passage. Tide is fairly low in this photo.
Photo 2 shows the entrance taken 21 April 22 at 19:07 BST when the tide level was about 3.9 m. Another 0.5 m would probably allow entry in low swell.
Photo 3 was taken on 14 July 22 when the tide level was 4.4 m and the swell was quite low.
Photo 4 inside on 14 July 22, looking NNW. The arrow to the right indicates the way to the E entrance. There were a lot of moon jellyfish (Aurelia aurita). The tunnel continues for 17 m after the join. A shag was nesting on the suspended rock near top left.
Photo 5 looking out of the S entrance on 14 July 22.
Photo 6 looking about NE towards the E entrance. Taken just before passage through by kayak. There was just enough headroom and the swell was in a lull. Also 14 July 22 at 14:03 BST.

This entry was last updated: 2022-07-16 20:07:26

Errors or omissions in this information? Submit corrections/additions/comments for this entry to the registrars.

NGR:	NO 88138 83154
WGS84:	56.93951, -2.19657
Length:	90 m
Vert. Range:	17 m
Altitude:	-2 m
Geology:	Dunottar conglomerate (with Tremuda basalt above)
Tags:	Other
Registry:	main

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