The lagoon was hot . Not the advertised 38 degrees Celsius. Hotter. A hidden fissure had opened two weeks ago, feeding a new vent directly into the deepest basin—the one they’d cordoned off with floating orange barriers. The sensors showed 54 degrees near the bottom. Possibly 60. The plant manager had ordered her to reroute the flow. She had a better idea.
This "used" geothermal fluid is what fills the Blue Lagoon. By the time it flows into the man-made lagoon, it has cooled significantly, but it is still standard you need to know: an average of 37°C to 40°C (98.6°F to 104°F) . the blue lagoon hot