British filmmaker Paul Berriff had been embedded with FDNY's 79th Battalion for weeks before September 11, 2001, following Battalion Chief Mike Puzziferri, Engine 79, and Truck 37 on ordinary calls. His camera stays with that crew as the day turns into the worst one in the department's history, capturing the firefighters' own footage and later interviews rather than reconstructed drama. The film follows the aftermath as closely as the attack itself, including the Staten Island lot where wrecked fire trucks and pulled debris were hauled and cataloged, a detail few other 9/11 films show. Puzziferri and his men speak plainly about what they saw and who they lost, without narration smoothing over the gaps in their accounts. Berriff's prior access is what separates this from the general run of anniversary documentaries: he was already inside the firehouse when the call came in, and the film never leaves that vantage point for a wider, more distanced view of the attacks.