Ocean tubes

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The ocean tubes can take two forms for most distances being both extrusion formed onto still costal waters estuaries or harbors or berrier lakes or islands that might emerge after ocean rise.  These tubes accommodate full ET3 evacuation or an as yet uncertain suspended monorail evacuation level.  The monorail tubes will be about two to three feet larger in diameter than the ET3 tubes that might be built larger to accommodate the monorails in the same tubes at different times.  Eventually a century of several from now all the tubes will become the faster more efficient but I tially more costly ET3 system.

basalt cloth is rolled out in layers with a new type of polymer cenentasious binder filler between.  High vibratory or roller packing causes the tube walls to extrude at about 6 inches per second.  Couplers are installed inside the low pressure extrusion and propulsion system installation machinery that in itself is the largest machinery line.

The tubes are capes with a propulsion system and hung with coils of neutral buoyancy tethers that are sheathed with a dynamic shell for transport to the end of the ever extending line.  The production machinery itself has to be nautically mobile to keep it as near as possible To a place economicly conveniently between the materials supplies and the extending distant anchored tubes.  On arrival the one to three mile long tubes are fitted with a bulbous airlock expansion slip actively motorized joint.  Toledo like ancho rugs pull out the tethers and tow the ends and one of several different anchor forms quickly down to the bottom where either deep rock bolting or silt bags or expanding anchors of screw or folded plates will hold to the bottoms.  On tube pumps will sink them to operating depts of 100 to 200 feet where they will be coupled up.  As soon as anchorage has been achieved like a upside down suspension or cable stalled bridge to reduce the number of anchor points.  Wet articulated clamp adjusters align the tubes perfectly against ocean forces and realign after a impact or earth quake automatically.  As with the high speed land systems storms, earthquakes, total waves, approaching , subs, whales, ice burgs or sea ice that can not be controled around surface vent and egress locations will need to have fully automatic systems to slow or stop and reverse or reroute traffic in an emergency.  The systems have to constantly test the test sensors and stresses at critical points.  Failure is not an option at all.  Overlapping anchorage systems might assure redundency.

there are a lot more details but many variable design approaches and cost effectiveness issues to talk about.

the tubes are about the cost of rural four lane divided highway expressways over land.  This is an intercontinetal interstate network going in every direction bypassing port cities for mostly inland direct traffic pattern routing.  The old ocean lane and air lane patterns are replaced with a more homogenized grid.