The pilot at Nagasaki Port fell into the water at around 0530 Tokyo time on 5 May while boarding the cruise ship DIAMOND PRINCESS, which was about to enter Nagasaki.
The NTSB determined that the probable cause of the contact of the Miss Mollye D tow with the Route 182 bridge was a loss of control of the tow by the pilot at the helm of the towing vessel, likely due to impairment by factors such as fatigue or drug use.
This publication (2024) details the rules, regulations and procedures that should be followed when preparing for pilot embarkation and disembarkation. It includes relevant excerpts from SOLAS regulations and IMO resolutions.