Martin Andrews, 43, and his 19-year-old son Jack died while out magnet fishing for metal in a waterway in Huddersfield earlier this month.
Inquests into their deaths were opened and adjourned at Bradford Coroner’s Court on Wednesday.
The brief hearing heard how the pair, who lived in the Pudsey area of Leeds, had gone out early on June 16 to go magnet fishing which involves trawling waterways for metal using a very strong magnet on a rope.
Concerned passers-by at the stretch of canal close to the River Calder, in the Cooper Bridge area of Huddersfield, raised the alarm when items were found on the bank.
Coroner’s officer Paul Denison told the hearing how a phone rang and, when an officer answered it, it was Mr Andrew’s wife, Angela, who said she was concerned because “it was out of character for them not to be home before lunchtime”.
Police divers were called and their bodies were found completely submerged near to the floodgates.
Assistant coroner Peter Merchant adjourned the inquest to a date to be fixed.