The dive site itself is relatively shallow, with most of the life above 25m. The site can be quite exposed to the weather so it is not always an option.
The site consists of a series of fingers and ridges pointing south from the island and stepping down to a gravel and rock bottom to the south and east at a general depth of 20-25m. Otter Spit effectively narrows the loch in the locality of Glas Eilean and accelerates the tidal flow past it. This makes for a proliferation of filter feeding life and a bottom that is swept free of the silt that covers many other parts of the Loch. The tops of the fingers and ridges are covered in dead man's fingers and plumose anemones, and many other types of anemones, with gravel ledges in between. The rock is mostly rounded but there is one large crack that runs up the east side of the island at around 10m, which has congers, hermit crabs, squat lobsters, and the usual assorted crevice life.
In addition, during the winter months vast quanties of nudibranchs have beeen seen here, including Highland Dancer opisthobranchs (Pleurobranchus membranaceus) which are common in Loch Fyne at certain times of the year, and can sometimes be seen swimming.
This stunning dive is one not to be missed.
