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While completing a maritime patrol flight over the Japan Sea, the crew encountered problem with an engine that caught fire in flight. The pilot-in-command elected to ditch the aircraft that eventually crashed into the sea about 160 km off Wonsan, North Korea. Ten crew members were killed while four others were rescued.
Crew:
Lt Dale Anderson, †
Lt Wayne Eugene Bancroft, †
Ens Donald E. McKinney,
Ad1 George E. Haigh Jr., †
Al2 John A. James, †
Ac2 Rufus L. Mounce, †
Al3 Robert L. Newman, †
Ad3 Joseph O. Smith,
Ad3 Robert W. Stapleton,
At3 Max E. Studer,
Am3 William D. Wynn, †
AN Ernest N. Franklin, †
Aoan Frederick C. Lynch, †
Aoan Clinton B. Macklin. †

Crashed in unknown circumstances into the Caribbean Sea, killing all three crew members.

In the early morning, two Neptunes of the Navy based at Quonset Point NAS were engaged in an anti-submarine warfare exercise off Block Island with the submarine USS Piper (SS-409) and the navy tug USS Hopi (AFT-71). Shortly after 0400LT, both aircraft rendezvoused over the Jamestown Bridge in Narragansett Bay, and headed for the operational area about 70 miles off Block Island. In unknown circumstances, the airplane banked right and then crashed into the sea. All eight crew members were killed.
Crew:
Lt Noble R. Kean,
Lt Thomas J. Tiernan,
A3c John R. Quirk,
A2c George A. Buehler,
Lt Seymour A. Moyl,
A1c Roland O. Eades,
Sea Salvatore A. Coia,
Sea Joseph A. gray.
Source:
http://www.newenglandaviationhistory.com/tag/p2v-neptune-124242/

Crashed in unknown circumstances on the Fletcher's Ice Island (North Pole Ice Station T-3) located in the Arctic region. There were no casualties but the aircraft was abandoned on site. Later, the iced island that was an iceberg detached and drifted away.

On the leg from Luqa to Benghazi and while flying over the Mediterranean Sea, an engine failed. The crew reduced his altitude and attempted to ditch the aircraft about 160 km northwest of Benghazi. All 32 occupants were rescued by the crew of a USN Albatross and transferred on a Royal Navy ship. The aircraft sank and was lost.

The crew was performing a reconnaissance mission following the disappearance three days earlier of a Swedish Air Force TP-79 into the Baltic Sea. En route, the Catalina was shot down by the pilot of a Soviet MiG-15. The pilot-in-command was able to complete an emergency landing and all five crew members were rescued by the crew of the German merchant ship christened 'Münsterland'. The airplane was lost.

While approaching Ipoh on a flight from Medan, the crew encountered poor weather conditions when control was lost. The aircraft crashed into the Malacca Strait, few km off shore, killing all 17 occupants.

The heavy bomber left Kadena AFB at the end of the day on a bombing mission to Korea. Around 2154LT, the last radio contact was recorded while the aircraft was cruising about 100 miles north of its departure point. SAR operations were conducted but eventually suspended as no trace of the aircraft nor the crew was found.
Crew:
Cpt Robert H. Adams,
1st Charles E. Allen Jr.,
2nd Lt Richard G. Bristol,
Cpt Robert R. Hebert,
Cpl James W. McLain,
1st Lt Irwin Moldafsky,
Cpl Leonard G. Owens,
2nd Lt Paul H. Reiche,
M/Sgt James Ruska,
T/Sgt Arthur H. Schuman,
Pfc Clem L. Stinnett,
Cpt William E. Threlkeld,
Cpl Merlyn K. Williams.

The aircraft was engaged in an exercice in the Mediterranean Sea, carrying six crew members and one passenger (a photographer) on behalf of the 203rd Squadron. While simulating an aerial attack of a submarine, the pilot-in-command completed a last turn to reach the target when the right wing broke off. Out of control, the airplane crashed into the sea. Five crew members were rescued while a sixth and the passenger were killed.

An engine failed en route, forcing the crew to ditch the aircraft into the Japan Sea, off the South Korean coast. All occupants were evacuated safely while the airplane sank and was lost.