MDN 51/2025

SÉCURITÉ

Acoustic monitors placed east of Hong Kong International Airport for ecological survey

No longer in forceReceived 14 Mar 2025, 00:00 UTCArchived 30 Sept 2026, 12:45 UTC

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MARINE DEPARTMENT NOTICE NO. 51/2025 (Marine Works) Temporary Establishment of Acoustic Monitors for Ecological Survey to the East of the Hong Kong International Airport With immediate effect and for a period of approximately 10 months, acoustic monitors will be temporarily established on the seabed at the following locations (WGS 84 Datum): (A) 22-19.07N 113-57.77E (B) 22-18.40N 113-56.85E 2. Acoustic monitor is an instrument for collecting ecological survey information. It will be fixed to a metal frame structure of pyramid shape with a height of about 2 metres and a base of 1 metre by 1 metre on the seabed. 3. Laying of the acoustic monitors will be carried out by one work boat. A working area of approximately 10 metres around the work boat will be established. The work boat engaged in the works will display signals as prescribed in international and local regulations. 4. Regular diving operations for inspecting and retrieving data from the acoustic monitors will be carried out at the above locations from time to time. The hours of operations will be from 0700 to 1900 hours. No operation will be carried out on Sundays and public holidays. 5. Vessels navigating in the vicinity should proceed with caution and keep clear of the works locations at slow speed, bearing in mind that there are divers working in the area. 6. A drawing showing the locations of the acoustic monitors is attached to this Notice. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 14 March 2025 Action File Ref.: L/M. No. 7/25 in MD-PD&PS-F01-075-01A-003-P064

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Analysis

No longer in force

Acoustic monitors will be temporarily established on the seabed at two positions east of Hong Kong International Airport for an ecological survey. Installation is effective immediately from 14 Mar 2025 for approximately 10 months. Regular diving inspections and data retrieval will take place from 0700 to 1900 hours (no operations on Sundays and public holidays). Vessels should proceed with caution, keep clear of the works and be aware of divers.

Type: Survey operations · severity moderate
Feed: Survey operationsAll warnings of this kind on the map, or as an API feed.
Location: East of Hong Kong International Airport
Validity: From 14 Mar 2025, 00:00 UTC
Until 14 Jan 2026, 00:00 UTCWith immediate effect and for a period of approximately 10 months
Activity periods: 14 Mar 2025, 07:00 UTC - 14 Jan 2026, 19:00 UTC (Regular diving operations daily 0700-1900 hours, no operations on Sundays and public holidays)
Hazards: seabed-mounted acoustic monitors, work boat and working area, diving operations

Worked out automatically from the warning text on 30 Sept 2026, 12:19 UTC. It can be wrong: the official warning text is the authority.

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Action for mariners
Keep-clear distance
Ships named
Translations
Nearby lights and rescue centres

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Keywordsdiving operations divers working keep clear of

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