National Response Center Incident Report 903023 - filed by USCG Sector Honolulu (808) 8422606. Called 06/19/2009 to fill in report and submit.

Owner/operator was diving.  When he surfaced, the vessel was partially filled with water.  He climbed aboard and more water entered the vessel before it capsized.

Owner/operator's account (verbatim):  Early morning April 17, I left Ala Wai for a 3 day trip to Molokai.  Winds were light and seas were calm, with a small north swell.  I anchored near Mokio Pt. and jumped in for a dive in water about 80 feet deep.  The water was clear and the current was light.  At the end of the dive I surfaced to find that the stern of the boat largely underwater.  I got in the boat and tried to get the engines started, but the boat settles and starts to roll.  I got clear of the boat and it slowly rolled over.  The boat ends up upside down, with the bow somewhat out of the water.  After a while, I swim under the boat and got my bail-out kit from the cabin.  The kit had water, night flares, smoke flares, a rescue streamer, small knife, and an EPIRB locator beacon. I could not attract another boat, so I activated the EPIRB beacon and a Coast Guard helicopter shows up and gave me a ride to Oahu, arriving back on island about 1 p.m.  At 10 p.m. that evening, we left Honolulu back to Molokai on the Huki Pau, owned by Sea Engineering Inc.  Arriving at dawn on Saturday, the boat was nearly as I left it.  We spent several hours recovering the boat and gear, including things that fell to the bottom.  The boat was brought back to Honolulu, we removed the engines for salvage, and a survey was performed.  Damage to the hull (incurred during recovery) was repaired by Pacific Diversified Inc, and Mobile Outboard Marine repaired the motors and helped rerigged the boat.  All lights and pumps were replaced, as was all wiring, batteries, switches and other electrical and electronic components.  On July 7, the boat was relaunched and is now back in its slip (B-10) at the Ala Wai Small Boat Harbor.  I still don't understand exactly what happened that caused the boat to fill with water.  We have found no structural problems.  The boat was heavily loaded, but its been that heavy before in rougher water without problem.  I do not know, and may never know, what caused so much water to get into to boat to cause it to swap.
Moomomi                       