The map has a ring of satellite towers, and one central lynchpin
tower. Ring bunker entrances are shielded, with each bunker's switch
controlling the shields of the _next_ bunker clockwise. The lynchpin
switch controls secondary entrance shields for all ring bunkers, and is in
an exposed location.
Seems to play decently when tested with bots. Teamwork and control of the
lynchpin are key, here. If your team loses control of the lynchpin, it's
possible to be trapped in a ring tower until control of the lynchpin or
another appropriate ring tower is regained.