The crew and science party aboard the RV Celtic Voyager braved 4m swells to sail out onto the Celtic Sea and begin multibeam sonar data collection during the evening of Day 3 (23rd Apr) untill midday Day 4 (24th Apr). Conditions were not good, but it is a credit to all crew and science party that a 10*6km box of territory was successfully mapped for the first time using the EM1002 hull-mounted sonar system.
The inclement and worsening conditions forced the ship into Castletownbere port by evening. The venture can be seen on this ship track image:
The unprocessed multibeam imagery from Day 3 confirms the presence of a NE/SW trending seabed ridge at the survey location, which has only ever been inferred from much coarser resolution regional bathymetries (e.g. GEBCO)