The idea behind Island Zero Alpha is to move up to larger habitats than the International Space Station and to learn more about the effects of pseudo-gravity on humans in space. The station is expected to have a crew of around fifteen to twenty.
The spiral tunnels leading from the central hub to the habitat modules on the ring are to ensure a graduated transfer from 0g to 0.5g in the habitat modules. The ring running round the habitat is primarily for emergency access. Please watch in HD if possible.