NEC-LIST: Antennas in water

I want to use NEC4 to calculate the coupling between antennas when either:

1) one is underwater and the other above water (with also lateral separation)

2) They are both underwater but close to the surface. In this case the antennas
may primarily communicate via surface waves at the interface since the direct
propagation is attenuated in water. It's therefore important to take this effect
into account.

I understand its possible to have buried wires in NEC4 so this should be possible
but does anyone have experience with the accuracy of this?

John Blackburn.

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