The submarine part of the Eva Chat, named Eva Baleine, is a titanic project. At first glance, it will not be possible to build it for less than 25 million USD per kilometer. However, it is possible that some tricks will be found by the beginning of the construction.
For example, if the tube assembly process takes one hour for four 20-meter tubes, the 8900 km of the 6-node network will take a total of four years.
This extraordinary image may seem to carry no information, but it is the very foundation of the construction principle of Eva Whale. That is to say the installation of each pipe that put end to end, will form the highway of the future. We can see, in the drawing, a view of the inside of a pipe, in green a very powerful magnet that will be used to place and hold the two pipes to connect. Once the outer fasteners are tight, we can unscrew the two contact surfaces to release the anti-pressure reinforcement thickness. To be able to extract the reinforcement from the network, we will divide it in two by the pink screws. Thus, the water will never penetrate, in theory, in the circuit. It will be possible to send robots to perform this task, because even a small human would have a lot of difficulties to achieve it.
It should be noted that the scale is not respected in this drawing, and that the diameter of the removable wall is smaller than that of the tube. Also, do not forget that the reinforcement splits in two.
I am now in this version that could certainly include the previous one, with adjustable ties, since it would be difficult to place the Suzane-Anchors in the ocean floor. One should also think of lateral forces that could be more powerful and require additional string triangles.
We can now think of a single depth 175-225 meters below the surface, for the entire length of Eva Whale. The distance between each pair of balloons, in this case is 500 meters, and could easily be changed...
Contacts between marine animals and the system will certainly pose significant problems. It is imperative to provide a whale-tube collision, a valve system at regular intervals, as well as a system such as this one: 300 m resistant capsule; Sufficient air supply; Sections of tube that separates from the network and lets escape the capsules; Inflatable boat and survival kit on each stretch; Several security ships off
With all this, it is not likely to lose more than 10 lives (a train-a collision) per year. As far as the safety of the road itself is concerned, two parallel systems are needed, as the drawing above describes.
The following system should be deployed before the start of construction for a period of at least two years. Probably the deployment could do this at an average interval of 1 km, but for reasons easy to understand it will have to be closer to the areas where the sea current changes direction :)
For the US (Portland) route, up to the France-England Channel, by Greenland, or 8900 km, it would therefore 10,000 detectors. In a first estimate, see the following pages, the electronic circuit will not cost more than 25 USD, and this if we manufacture it in America. The balloon could cost around $ 10, the 50-700m nylon rope about 0.30$/m averaging $ 50, and the anchor in anything that comes to hand, about $ 5. For a grand total of less than $ 100 per tag we will need to ask and recover for data analysis. Once again: $ 1,000,000 of detectors + $ 500,000 / boat + 3 months of operations at $ 100,000 / month = less than 2 million USD. For recovery, it's more complicated: rope cut, under the effect of a signal; pick it up with nets
Anyway, sailors, we will be a great help in this matter. But even if it would be more expensive, it is required ... The current data, gives us the values of the order of 0.6 m / s max, but it is the conjunctions of currents which pose problem and their directional variation.
It is not easy to fill these balloons on the surface because the required pressure is too high. But, we could bring down small containers of liquid nitrogen, which once evaporated, would fill the said balloons to the required pressure. Example among many others: 5 m³ ==> PV = nRT: n = 2 E6 Pa * 5 m³ / (8.31 * 280 ° K) = 4 298 mol, which means: 120 000g / 0.808 g / cm³ = 148 515 cm³ = sphere of 32.9 cm radius = transport problem, but the cost is not bad: 1.50 Euro per liter = 225 Euro. Perhaps Oxygen: 1.429 g / cm³ = 28.4 cm radius, but more difficult to liquefy. So, in summary 50 USD / m³ of balloons, multiplied by 56,000,000 m³ = ± 3 billion US dollars for the Portland-Europe link, only in liquefied gas. We will take measures, not to lose too much gas in the water each year :)