Minutes matter: how the Seraph cut medevac response times on Mars

Before the Seraph Medevac entered service in early 2184, a serious injury at a remote Mars outpost meant a grim calculation. A Wren could lift the patient to orbit, but then someone had to find a ship heading toward a hospital, negotiate a diversion, and hope the transfer was fast. In 2183 our records show the average time from emergency call to surgery for off-surface trauma was 31 hours.

Two years later, with four Seraphs stationed across Mars orbit and the Olympus Ring, that figure is 8 hours 40 minutes. I want to explain how, because the ship is only half the story.

The Seraph itself is a 74-metre, two-pilot rescue ship with a crew of nine: two pilots, a flight surgeon, two trauma nurses, an anaesthetist, a respiratory therapist and two rescue technicians. It carries up to twelve patients in a trauma ward and has a full surgical bay. Its antimatter-catalysed fusion microcapsule drive gives it a top speed of 780 km/s and burns only 3.2 tonnes per 100 AU, which means it can sit on station for months and still sprint when called. Its 30 AU range covers the whole inner system with margin.

The other half is choreography. Every Seraph keeps a standing coast orbit that puts it within 90 minutes of any populated latitude on Mars. When a call comes in, our controllers on Luna and at the Olympus Ring do three things in parallel:

• Dispatch the nearest Wren or Cascade to lift the patient to a rendezvous orbit.
• Burn the nearest Seraph to that rendezvous, with the surgeon briefed en route.
• Alert the receiving hospital and pre-book a docking slot.

Because the Seraph's surgical bay is fully equipped, the surgeon often begins definitive care in orbit, during the transfer burn. In about a third of cases last year the patient was out of surgery before the ship docked. Time-to-surgery, not time-to-hospital, is the number that matters, and it is the one we now publish monthly.

At 96 million credits per ship the Seraph is not cheap for a public health service, but it is cheap compared with what it replaces. The Mars Settlement Health Authority estimates the program prevented 46 deaths and more than 200 cases of permanent disability in its first two years.

We are now applying the same model to Ceres and the wider Belt, where distances are greater and the case for a fast medical ship is even stronger.