KEY FACTS Date: December 1900. Location: Eilean Mòr, Flannan Isles, Outer Hebrides. Missing: Three lighthouse keepers. Last recorded activity: 15 December. Discovered: 26 December. Category: Unexplained Events. The Light That Went Unanswered On 26 December 1900, the lighthouse tender Hesperus approached one of Britain’s loneliest outposts. No flag rose above Eilean Mòr. No provision boxes…