1) What is the size of the pipes you are considering? Will it be big enough for humans to get into for maintenance - I was thinking what would happen if a delivery vehicle breaks down or a small animal gets into a tunnel.
2) Have you considered small blimps as delivery vehicles? The technology has got considerably better and should be less noisy than drones.
1) What is the size of the pipes you are considering? Will it be big enough for humans to get into for maintenance - I was thinking what would happen if a delivery vehicle breaks down or a small animal gets into a tunnel.
2) Have you considered small blimps as delivery vehicles? The technology has got considerably better and should be less noisy than drones.