Mystery remained following an inquest into the death of a 24-year-old Bangor man in Vietnam last January.
An open conclusion was recorded at Caernarfon on Sam Bryn Burton Sadler of Siliwen Road, who worked in sales and died in Ho Chi Minh City.
North West Wales senior coroner Dewi Pritchard Jones said there was fluid in the lungs.
But embalming had destroyed evidence.
Pathologist Dr Mark Lord said there could be a natural cause or other reasons for the death.
No details were given about what he was doing in the country.
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