Dubh Artach Lighthouse.
Initial construction on the rock, which began on 25 June 1867 under the supervision of Alan Brebner, required a barrack for the workmen made of iron.
Summer gales brought high seas, which resulted in breaking water falling on the roof 77ft. above sea level.
It held firm, although fourteen men including Brebner were trapped there for five days,
and at one point seawater poured in through the trapdoor, swirled around them and exited
with their remaining food supplies.