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Ryan stared at the four legs. They were hard to ignore.
Marsh read his expression and explained before he could ask.
"The legs serve a dual purpose. In transit mode, the two pairs merge into standard bipedal legs using an interlocking joint system. The mech walks on two legs like Scrapper. When it reaches the fire zone, the legs split apart. Each pair separates into two independent limbs, and the mech lowers itself into a stable four-point platform."
"A platform," Ryan repeated.
"That's the core concept. We rethought the role. Instead of a firefighting robot that fights fires, it's a mobile fortress that carries firefighters into the fire and protects them while they work."
Marsh walked Ryan through the design philosophy.
In a forest fire, the terrain was the enemy as much as the flames. Standard fire engines couldn't reach the fire line. Firefighters advanced on foot, dragging hoses and equipment through brush, smoke, and heat. When the wind shifted and the fire turned, they had seconds to find shelter or die.
The firefighting mech solved both problems. In bipedal mode, it traversed terrain that no wheeled vehicle could reach, using its legs to step over obstacles, ford streams, and push through undergrowth. At the fire's edge, it transformed into its four-legged platform configuration: a stable, fire-resistant base of operations that could hold its ground in the middle of a blaze.
"The cockpit seats one pilot and up to nine crew," Marsh said, pointing to the 360-degree glass enclosure. "Fire-rated transparent panels on all four sides. The pilot has unobstructed visual contact with the surrounding environment. No blind spots."
"The crew enters and exits through an internal ladder that drops down from the hip joint. In platform mode, the ladder extends to ground level. In an emergency, the crew retreats inside, the ladder retracts, and the mech's thermal protection system seals them in."
Ryan looked at the legs more carefully. Each one had visible mounting hardware for external equipment.
"Water storage," Marsh confirmed. "Four tanks on the lower legs, four smaller tanks at the waist. Total capacity: twenty-six tons of fire suppressant. The waist tanks can transfer their contents to the leg tanks via internal rails before the mech enters platform mode, lowering the center of gravity and adding structural rigidity to the support frame."
"And in platform mode, the mech deploys stabilizer struts from the hip to handle the load," Ryan guessed.
"Exactly." Marsh looked pleased. "You can see the strut housings here."
He unfolded a structural diagram and handed it to Ryan. The design was more sophisticated than the exterior suggested.
The mech wasn't just a walking water tank. It was a complete firefighting system. Three high-capacity water pumps fed three outlets: one in each hand and one mounted on the back. Combined output: five thousand liters per minute. Maximum range: nearly three hundred feet. At full flow, the mech could empty its entire twenty-six-ton water supply in six minutes.
A dedicated intake pump could refill the tanks from any natural water source in under forty minutes.
The wrist assemblies carried cable hoists capable of lifting and swapping the leg-mounted water tanks, allowing rapid replenishment at a forward supply point. Roll up, detach empty tanks, attach full ones, return to the fire line.
The thermal protection system used high-silica fabric over the entire exterior surface, the same material family as professional firefighting suits, rated for sustained operation at 1,800 degrees Fahrenheit. Cooling nozzles distributed across the hull could spray water from the internal tanks onto the mech's own surface, providing active temperature management. Beneath the thermal layer, an insulation barrier protected the internal systems and crew compartment.
The circular saw blades on the feet served a tactical purpose: clearing debris, cutting through fallen trees, creating firebreaks. In platform mode, they could be lowered to ground level and operated remotely.
"So it's a mech, a fire engine, a crane, and a bulldozer," Ryan said.
"In a mech-shaped package," Marsh agreed. "The forest fire scenarios we modeled showed the highest casualty rates occurring when wind shifts trapped crews in the fire zone. This machine eliminates that. The crew operates from inside the mech's protection envelope. When conditions deteriorate, they pull back inside, seal the cockpit, and the mech walks them out."
Ryan studied the structural diagram for another minute, then set it down.
"Center of gravity in platform mode. With the waist tanks transferred to the legs, the upper body is lighter, but the cockpit with nine people adds variable load. How does the balance system handle crew movement inside the cabin?"
Marsh nodded. "Good question. The platform mode includes a dynamic balance system derived from Scrapper's gyroscopic mount. It compensates for internal load shifts in real time. We tested it with simulated crew weight and got stable readings across all scenarios."
Ryan was genuinely impressed. The professors had taken Scrapper's technology, understood its principles, and applied them creatively to a completely different mission. The mech in front of him wasn't a copy of Scrapper. It was a new machine, designed by people who'd learned to think like mech engineers.
Over by the scaffolding, the first activation was beginning.
One of the Peterson triplets climbed the internal ladder and settled into the cockpit. The neural link gear was Scrapper's, temporarily transplanted for the test. The firefighting mech didn't have its own neural link installation yet.
"Ready," the pilot's voice came through the intercom.
"Start the sequence," Marsh said.
The pilot worked through the startup procedure. This cockpit didn't have Scrapper's holographic display. It used mechanical switches and touchscreens, functional and unglamorous. The kind of interface you could operate while wearing firefighting gloves.
The reactor hummed to life. Systems came online one by one. Status indicators lit up across the cockpit's instrument panels.
The mech powered up.
And the first thing Ryan noticed was the emergency light bar mounted on the top of the cockpit, strobing red and white in an alternating pattern that screamed "fire truck" louder than any siren could.
"Really?" Ryan said, looking at the flashing lights.
Marsh grinned. "The fire department consultants insisted. If it's going to a fire, it needs emergency lights. Regulations."
Ryan looked at the world's second mech, standing in a hangar, neural-linked to a pilot, powered by a plasma reactor, armored in fire-resistant fabric, carrying twenty-six tons of water on its legs, with four circular saws on its feet and a 360-degree glass cockpit.
And flashing emergency lights on top.
"Fair enough," he said.
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