Re "Billionaires pitch: Half-hour from S.F. to L.A. by capsule" (Business, Aug. 13): Maybe we could send passengers and water in the same tube, passengers in pods. I haven't figured out how to get them on and off at stations but I figure I have given it as much thought as the hyperloop guy. This way we could roll two expensive, unnecessary projects into one. We could call it Hydraloop.
-- John West, Sacramento