>>13549460The ice wall. It's sort of described on the show "In search of...". Coast guard ship travels around in the Bermuda triangle only to breach the ice wall. Perhaps there are literal warp zones scattered around there. That or they used it as a way to reveal the ice wall to the public with out people taking it too seriously.
vidrel.
https://youtu.be/FluvcILjThg?t=353