What kinds of adjustments need to be made to the existing design to allow ET3 to travel across oceans (to Hawii for example)?

ET3 to HI is not presently deemed feasible, but may be in the future.  The cost would likely be much greater than the benefit.   Connecting most of the islands of HI to each other  may be feasible however using SFT (submerged floating tunnel) technology.  The best place to cross oceans is the Bering Strait between Alaska and Siberia.

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