evidence: Zanella explained that fishing is the foundation of livelihoods here, and Socotri have always lived close to the sea. While most Socotri now live in small coastal villages and towns, more than 30 caves have been discovered on the island. And here in the north, those such as Hoq Cave, the largest on Socotra, have historically provided safe shelter from both the unforgivingly high summer temperatures and strong monsoons in winter. Despite living only 2km from the town of Qalansiyah, Ellai still chooses to live in a cave, and in many ways, Zanella explained, he is something of a living testament to the way ancient Socotri once lived on this far-flung island. Marooned between Somalia and Yemen where the Arabian Sea and Indian Ocean meet, the Socotra archipelago is one of the most isolated continental fragments on Earth – a piece of Africa adrift at sea. The high proportion of endemic flora here have led some to label this Unesco World Heritage site the "Galapagos of the Indian Ocean". More than one-third of Socotra's 825 plant species and 90% of its reptile species don't live anywhere else in the world, and gazing up at the islands' surreal, umbrella-like dragon's blood trees and down at thousands of bright blue and red freshwater crabs that scurry in the twilight, it can feel like you're on another planet.