Five Days at Memorial does something few disaster dramas manage: it refuses to give you a hero to hide behind. Set inside a New Orleans hospital as Hurricane Katrina takes the power, the water, and eventually the oxygen, it walks you hour by hour through a building that stops functioning as a hospital and starts functioning as a trap.

The first half is pure dread. Generators cough, corridors darken, and the temperature climbs until you can practically feel the air in the room. Vera Farmiga is extraordinary as a doctor slowly realising that no one is coming, and the ensemble around her plays exhaustion so convincingly that the series starts to feel less like television and more like footage.

Then the back half turns into something harder — an investigation into what happened to the patients who never made it out. It is here the series earns its weight, refusing easy verdicts and letting you sit uncomfortably with the question of what any of us would have decided on day five with no power and no plan.

It is haunting, and the most shocking part is remembering, again and again, that this is based on real events. Not an easy watch, but an unforgettable one.