Since Iran closed the Strait of Hormuz, commercial traffic has reduced by 95%, with serious implications for global fuel supplies. The blockade has been enforced with missiles, drones, and mines. However, while oil fixates the minds of the public, there is more to the Strait than the flow of fossil fuels. Hormuz is a hotspot of biodiversity in an otherwise inhospitable region. With high summer water temperatures and salinity, the Persian Gulf’s ecosystems are uniquely adapted to living on the edge.