Anonymous ID: 3f94aa April 10, 2018, 12:44 p.m. No.985907   🗄️.is 🔗kun   >>6006

>>985760

 

If there are tunnels, they would be above sea level. Look at the contour map of the island. Where could you run tunnels? Maybe an X-shape, with the center under the then-sundial / now-tennis court.

 

Temps controlled by surrounding ovean temp. Think infinite heatsink. Natural convection, fan assisted to ensure fresh air.

 

Need to find historical topo map and compare to present.