To be able to offer services to the world's largest container vessels, commonly known as Post-Panamax vessels, the Halifax Port Authority launched a dredging project to increase the berthing depth at its Nova Scotia facility. To monitor the movement of the existing pier during and after construction, sensors were installed in the sub-sea foundation 14 m below mean sea level. Vibrating wire strain gauges were attached directly to steel sheet piles (positioned adjacent to the existing concrete cribs) and both Bragg grating and Fabry-Perot fibre optic sensors were attached to anchor bolts used to attach the sheet piles to the cribs. Strain monitoring over approximately an eight month period indicated that the sub-sea shoring of the crib foundation has become engaged to resist the slight settlement of the cribs. The resulting stresses are very low, however, confirming that the cribs are performing well within design and functional limits. The project also confirmed the durability and effectiveness of the use of fibre optic sensors in marine environments.