FLANNAN ISLES

Opening

On 26 December 1900 the lighthouse tender Hesperus reached Eilean Mòr, the largest of the Flannan Isles, a cluster of rocks in the Atlantic about 20 miles west of Lewis in the Outer Hebrides. Nobody came down to meet her. Relief keeper Joseph Moore went up to the lighthouse and found it empty.

The three keepers, James Ducat, Thomas Marshall and Donald McArthur, had vanished. The light had been out since at least 15 December, when a passing steamer noticed it was dark. They were never found. The official investigation blamed a huge wave, but legends, a famous poem and invented log entries have made Flannan one of the great sea mysteries.

Timeline

7 December 1899The Flannan Isles lighthouse, designed by David Alan Stevenson, is first lit.

15 December 1900The steamer Archtor, passing at night on the way to Leith, sees the light is not working.

20 to 26 DecemberStorms keep the relief ship Hesperus in harbour.

26 December, about noonHesperus arrives. Moore finds the gate and door closed, the beds unmade, the clock stopped, the lamps cleaned and ready, and one set of oilskins still hanging. The kitchen has been cleaned, which suggests the men left after a meal.

29 DecemberSuperintendent Robert Muirhead arrives. At the west landing he finds heavy storm damage: railings bent, a box of ropes kept in a crevice 110 feet above sea level torn out and scattered, and turf ripped from the top of the cliff.

January 1901Muirhead reports to the Northern Lighthouse Board that the men probably went to the west landing to secure equipment during a storm and were swept away by an enormous wave.

Key figures

James Ducat was the principal keeper and Thomas Marshall the second assistant. Donald McArthur was an occasional keeper filling in for a colleague on sick leave. Joseph Moore was the keeper returning from shore leave who found the station empty. Robert Muirhead investigated for the Northern Lighthouse Board.

Physical and documentary trail

The record: the Archtor report, Moore's account, Muirhead's report, and the lighthouse log, which runs to 13 December, with the slate entries for the following days.

Still missing: the three men. No bodies were ever found.

An extra large sea had rushed up the face of the rock, had gone above them, and coming down with immense force, had swept them completely away.

Things you might not know

• The spooky log entries are fake. Widely quoted entries about fierce winds, a keeper crying and the men praying were added to the story much later. Researcher Mike Dash showed they don't exist.
• The poem invented the overturned chair. Wilfrid Wilson Gibson's 1912 poem "Flannan Isle" describes an uneaten meal and an overturned chair. Moore found a clean, tidy kitchen.
• One man went out without his coat. The oilskins left behind suggest one keeper, probably McArthur, ran out in a hurry, perhaps to warn or help the other two.
• Leaving the light was against the rules. Keepers were never supposed to leave it unattended, which is why the men's absence was so strange, and why they may have risked the storm to avoid a fine for lost equipment.
• Hollywood made it a thriller. The 2018 film The Vanishing, starring Gerard Butler, imagined the keepers finding a chest of gold.
• Nobody works there now. The lighthouse was automated in 1971.

Competing explanations

A freak wave. Muirhead's reading: the damage high on the cliff shows the sea reached far above normal, and men working at the west landing could have been taken without warning.

One man lost, the others after him. A variant: one keeper fell or was swept in, and the others died trying to help. It fits the missing oilskins.

Something stranger. Sea monsters, foreign spies, a murder-suicide. None has any evidence, and most depend on the invented log entries.

Later life of the case

Flannan Isles has inspired poems, songs, an opera and films, and it is often retold with the fake details. The real record is short: an empty lighthouse, storm damage, and three men gone.

Finding

The best explanation is Muirhead's: the keepers went to protect equipment during a storm and were swept off the rock by a huge wave. The damage he found supports it, and nothing in the genuine record suggests anything else.

What still will not resolve: exactly what happened in the minutes after the three went down to the west landing, and why all three were out at once.