MTR NSL Immersed Tube Tunnel was constructed alongside the existing Cross harbour Tunnel. All Hydrographic Survey from trench excavation to gravel placement and unit deployment, was carried out using shallow draught "ESL Survey 1" and "ESL Survey 2" (shown above). Both vessels were also used on AA Third Runway Consultancy Contract 3117 "Independent Geophysical Seabed Surveys" undertaken by ESL from 2017.
"ESL Survey 1" is a specialist Hydrographic Survey Catermaran purchsed from the UK while "ESL Survey 2" was built to our detailed specification in 2018 and has dual Hydropods allowing for multiple sensors to be deployed simultaneously.
These vessels are equipped with a full suite of navigation, survey and geophysical instruments and are berthed in HK. They can be mobilised to your project at short notice.