Detectives are questioning a man on suspicion of murder after two bodies were found in a pond near an Army barracks.
The bodies are believed to be those of missing 17-year-old Hugo Wenn and Daniel Lloyd, who is understood to have been aged in his 20s.
Police are working on the theory that the pair and the 54-year-old suspect knew each other.
The two bodies were found almost 10 hours apart in Reed Pond, behind Howe Barracks in Canterbury, Kent, on Monday.
The first, understood to be Hugo, was spotted by a member of the public at around 12pm and the second was found by police divers at 9.40pm.
The deaths are being treated as unexplained pending post-mortem examinations, which are due to take place within the next 24 hours.
Formal identification has not yet taken place, but tributes have been paid to 6ft 3in "gentle giant" Hugo by friends and teachers at the Archbishop's School in Canterbury, which he left after sitting his GCSEs last summer. He was described as an accomplished beatboxer and busker who excelled in drama, sport and music at school.
He went missing last Friday, prompting his friends to launch Facebook and Twitter appeals to locate him. He was supposed to have met friends at a pub in Canterbury but texted at 8pm before they arrived saying he was leaving.
Hugo was seen walking along Canterbury High Street alone beatboxing to himself. Police were later alerted to his disappearance.
Reed Pond is on Ministry of Defence land behind Howe Barracks, but MoD officials ruled out any connection between the deaths and the armed forces. The land is open to the public, they added.