The Ares 4 MAV Modification

Lore & Background

The Ares 4 MAV was originally a standard NASA design, pre-positioned on Mars years before the Ares 4 crew's arrival. It was intended to launch the entire crew from the surface to orbit, where they would dock with the Hermes spacecraft. However, after Watney was left behind by the Ares 3 mission, he realized the MAV could be his only ticket off the planet, but it was too heavy and its flight path was set for a different landing site. To make it work, Watney had to travel over 3,000 kilometers across Mars to reach the Schiaparelli crater, where the MAV was stored—a road trip across an alien desert, living on potatoes and recycled urine, with nothing but his wits and a patched-up rover to get him there.

In Their Own Story

The wind howled across the Schiaparelli plain as Mark Watney stood before the Ares 4 MAV, its white hull gleaming under the thin Martian sky. He ran a gloved hand over the hull, feeling the cold metal through his suit. 'Alright, bird,' he muttered, 'time to lose some weight.' Inside, he began the painstaking process of removing every unnecessary component—seats, scientific instruments, even the fabric lining the cabin walls. Each piece was a gamble, a trade-off between survival and the physics of launch. When he finally hacked the flight computer to accept a single pilot, the MAV felt like a skeleton, but it was his skeleton. As he strapped in, the countdown began, and he whispered, 'Let's hope this thing flies.'

Reader's Guide

The Ares 4 MAV Modification is a testament to human problem-solving under extreme duress. In the canon, Watney's journey to the MAV involved a perilous traverse using a modified rover, relying on solar power and oxygen generation to survive. Once there, he removed all non-essential mass, including the seats for three other crew members and any equipment not needed for launch. He also altered the MAV's guidance software to account for a lighter payload and a different trajectory, as the original was programmed for a full crew. This modification allowed the MAV to achieve orbit with just enough fuel to rendezvous with the Hermes, which had been redirected to intercept him. The success of this plan depended on precise timing and Watney's ability to improvise, making it one of the most iconic moments in the story—a high-stakes MacGyver act where the only tools were a screwdriver, a text editor, and sheer force of will.

Did You Know?

• The modification required Watney to remove over 1,000 kilograms of mass from the MAV, including the seats and interior panels.
• The MAV's original design included a backup launch system that Watney had to bypass manually.
• Watney used a small explosive charge to blow off the MAV's nose cone, which was not needed for his escape.
• The MAV's flight computer was reprogrammed using a simple text interface, as Watney had no access to advanced tools.