 Steadily rising sea levels would then have slowly isolated and finally all but submerged the shoals of Skerryvore , a barrier of innumerable metamorphic remnants that stretch for 8 miles ( 13 kilometres ) lying in a south @-@ westerly direction . A detailed survey undertaken in 1834 listed more than 130 main rocks including Am Bonn Sligheach ( Boinshley ) ( Scottish Gaelic : The Deceitful Bottom ) and Am Bogha Ruadh ( Scottish Gaelic : The Red Submerged Rock ) . 
