One of the design principles for Halley VI was to include redundancy wherever possible. This led to splitting the base into two sets of modules, and linking them with a bridge. The North side consists of five modules: two accommodation modules, the command module, the social / main module and one of the technical modules (the closest one to the bridge). The South side consists of the other technical module and two science modules. The bridge acts as a fire barrier, hopefully allowing the use of one side of the modules in case of fire at the other side. The four generators are divided into two pairs, one on each side of the bridge. Finally the fuel and water tanks have also been distributed in a similar fashion.