From the website:
Bushbunker represents a concept that has been designed from scratch specifically as a bushfire bunker, and comprehensively engineered to withstand the severe environmental conditions that a major bushfire produces. It has been designed for maximum survivor ability no matter the intensity or type of fire.

A series of two fire doors is used to separate the entrance/storage area from the bunkers main interior to provide a fail safe, and to create an air lock which protects against the infiltration of radiant heat through the first steel fire door. This is an extremely important design feature, as some of the most severe burns to Black Saturday fire survivors were caused by radiant heat.

To outfit the interior, the design makes use of standard off the shelf components such as steel fire doors, steel frames and sealing, bench seating, compressed air cylinders, battery powered electric lighting, storage shelving, water drums, UHF radio and EPIRB, and fire blankets and first aid. This in turn allows for flexibility in the design, and reduces costs.

The Bushbunker has been designed to comfortably accommodate up to 6 adults for an extended period when equipped with compressed air cylinders. These air cylinders also have the additional feature of providing a positive internal air pressure inside the bunker making it impossible for noxious and poisonous outside gasses and smoke to enter.

Hanging above each seating area is a series of refillable standard 20 Litre water containers which provide a gravity fed source of clean water for drinking, cooling and first aid purposes.

Due to its standardized size and modular construction, and depending on the site conditions of a home, the Bushbunker can be specially incorporated into the structure of a house or home, free standing, set into an embankment or partially or totally buried underground.

From : Bushbunker

The motor automatically disengages from the pedals when desired so as to preserve battery life. Construction begins with a 12’ foot straight piece of 3⁄8-gauge, aircraft aluminum 6061 alloy that is roll-formed and annealed for uniform wall thickness into a complete 6′ diameter circular tube with a 4″ exterior diameter (the NiMH batteries reside within the tube from the front fork to the seat), which is then bisected to make a 6′ long arc for the bicycle’s frame. The sturdy frame supports riders up to 300 lbs.

The top of the arc provides a 26″ stand over height, allowing you to place both feet on the ground. The padded ergonomic gel seat provides for comfortable, relaxed riding. It attaches to the frame via a gas strut assembly that raises and lowers like a pneumatic office chair, accommodating riders between 5-7′ tall in a semi-recumbent position for ideal pedaling or powered coasting. A dynamo in the front wheel’s hub provides power for auxiliary lighting.

The bicycle has a range of up to 30 miles at 20 mph before requiring a five-hour re-charge from its AC adapter. Precisely tuned hydraulic disc brakes provide sure stops, and the wheels are made of dual-walled aluminum alloy and stainless-steel spokes; the 26″ semi-slick tires are ideal for roads or paved trails and use Presta valves. The bicycle is wet-painted in Rossa Corsa red using the same PPG color specification as high performance sports cars and treated with a clear coat finish for a luster that will last.

Designer : Marcu Hayes