Ventilation

The two bored tunnels join at a point in the centre of the Solent. At this point a concrete shaft will be formed to allow ingress of fresh air ventilation to the tunnel. The fresh air will be forced by fans into the tunnel to expel carbon monoxide and other fumes from the tunnel.

This formed shaft will also have a secondary use as a support for tidal turbines for electricity generation and perhaps even a Wind Turbine (not pictured). 

A third use for this shaft is for emergency exit use or access for emergency services should they be required to gain entrance to the tunnel from a central location. It is hoped that the tidal turbines will generate enough energy to power the electrical services of the tunnel and even the Monorail system installed on the Island.