Two men who were found dead along the Gloucester and Sharpness Canal near Purton were not from Gloucestershire, it has emerged.
It is thought that the pair had travelled to the area on narrowboats and may have been drinking at a nearby pub on the previous evening.
It is understood one may have fallen into the water, while the other suffered a heart attack during a rescue bid.
If the incident happened overnight the area would have been in total darkness too.
One man was found on the canal towpath on the Severn side and another was pulled from the water shortly before 10am on Sunday.
Gloucestershire Police said yesterday that they could not give any more details about the men until the police forces from their respective counties had been able to contact their next of kin.
After that, the Gloucester Coroners Office will be able to formally open an inquest into the deaths.
A spokesman said: “We are not treating either of the deaths as suspicious.”
On-lookers watched on as police cars and ambulances descended on the scene and a helicopter landed on the towpath. Rescue workers from the Severn Area Rescue Association were also dispatched to the scene on a stretch of canal towards Slimbridge, between Manor Farm and the Decoy Pool.