According to a Marine Department notice, acoustic monitoring stations will be temporarily established on the seabed at Lung Kwu Tan (NW New Territories near Tuen Mun) and Siu Ho Wan (N. Lantau) for the next 9 months.
The acoustic monitoring stations will collect data on dolphin vocalisations in the area. They are structures of pyramid shape with a height of about 0.8 m and a square base of 1 x 1 m. Its bottom will be embedded in the seabed.
Regular diving operations for inspecting and retrieving data from the acoustic monitors will be carried out by a work boat in the above locations every month.
Source: Government of Hong Kong SAR Marine Department Notice No.12 of 2016 dated 22 January 2016