Can Behemoth copy the specific ability of USS Lamon/Barracuda and ram another ship while submerged?
Just to confirm, the ignoring terrain ability does not allow you to shoot while overlapping a fog bank either? (similar to Ghost Ship as discussed above)
Correct. The same ruling applies to both (no shooting from inside fog).
Explosives sinks the ship but doesn’t do anything extra, so Eternal still functions normally and sends the ship home.