FOLLOWING the inquest into the death of Jacob Cockle, the harbour master in Hayle has issued a plea urging people to stay away from the dangerous sluice tunnels.
Peter Haddock echoed the deputy coroner's calls that Jacob's death should be a warning for others who were thinking of going into the water around Carnsew Pool.
He said: "We get people tombstoning from above the sluice tunnels.
"I want to highlight the dangers of this activity and the fact that they could get sucked into the tunnels.
"It's a very dangerous area. I want to warn of the dangers, especially near the culverts. There are signs, fencing and barriers."
Swimming in the harbour is prohibited unless permission is obtained from the harbour master.
Mr Haddock said the site was regularly checked but it was hard to stop people using the area outside the Harbour Authority working hours.
Carnsew Pool was originally built to hold water on the incoming tide which was later released through sluices to flush sediment from the harbour and keep the shipping channel clear.
Although the sluices have not been operational for many years, the pool fills and empties on the tide through the tunnels, which are encrusted with mussels and other marine growth.
Mr Haddock said the flow of water through the tunnels can often be dramatic, especially at high tide when whirlpools are formed as the water is sucked into the tunnels.
Jacob Cockle was filming the tidal phenomenon when he was pulled into the sluices and drowned.
As part of the planning for South Quay the area is to be restored to its original status, which includes reintroducing sluicing to the harbour.
"There will be various controls to keep public away from there. Safety procedures will remain in place and permanent fencing put around the sluices," added Mr Haddock.