In total, 3 timber gates were removed, weighing up to 39 tonnes each. The gates had been in place since installation in 1918 and despite being non operational for many years, the main structural timbers were found to be in remarkably good condition.
Constructex commercial dive team initially carried out de-silting operations to free the gates from years of sediment build up. Submersible hydraulic pumps were required to shift around 25 tonnes of material. Underwater chainsaws were used to cut out lifting gear attachment points. Once the gates were prepared, a 350 tonne mobile crane was brought in to carry out the complex lifting operation. The Constructex dive team remained on site to attach lifting gear and monitor lifts, with an inflatable buoyancy bag system on standby to assist re-floating and lifting operations.