On HARPY's dive platform can be seen a sidescan sonar and a short reel of tether. Approximately 100m of cable is on this spool. For deeper searches a hydraulic drum with 500m of tether and slip rings is used.
Other equipment includes magnetometers and ROVs, underwater video-enhancing hardware, RTK GNSS and, of course, software. To change over from fishing to surveying, or mobilizing, generally takes about a day.