The Acoustic Mid-Ocean Dynamics Experiment (AMODE) (1991-2)
Note the 5 pairs of parallel paths - (2,4) and (1,5); (1,2) and (3,5), etc.
Dushaw, B. D., 2003: Mode-1 internal tides in the western North Atlantic Ocean. In Limbo (Dispute with JPO).
http://faculty.washington.edu/dushaw/epubs/BDD_opus_submit2.pdf
(From my webpage, follow link to Publications)