MDN 57/2026

Seabed reinstatement works near Butterfly Bay, Tuen Mun

No longer in forceReceived 23 Mar 2026, 00:00 UTCArchived 30 Sept 2026, 12:45 UTC

Warning text

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MARINE DEPARTMENT NOTICE NO. 57/2026 (Marine Works) Seabed Reinstatement Works near Butterfly Bay, Tuen Mun With immediate effect and for a period of approximately six months, seabed reinstatement works will be carried out in the area bounded by straight lines joining the following co-ordinates (WGS 84 Datum) from (A) to (E): (A) 22-21.43N 113-57.27E (B) 22-21.40N 113-57.35E (C) 22-21.08N 113-57.23E (D) 22-21.11N 113-57.13E (E) 22-21.32N 113-57.21E 2. The works will be carried out by one hopper barge. One tugboat and one guard boat will provide assistance. Vessels engaged in the works will display signals as prescribed in international and local regulations. 3. A working area of approximately 50 metres around the hopper barge will be established. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the positions of the anchors extending from the working vessels. 4. The hours of work will be from 0800 to 1900 hours. No works will be carried out on Sundays and public holidays. Vessels employed for the works will not stay in the works area outside the hours of work. 5. Vessels navigating in the vicinity should proceed with caution. 6. A drawing showing the works area is attached to this Notice. This Notice is an extension of Marine Department Notice No. 182/2025. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 23 March 2026 Action File Ref.: L/M No. 21/25 in MD-PD&PS-F01-075-01A-003-P067

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Analysis

No longer in force

Cancelled by MDN 72/2026 (archived)

Seabed reinstatement works by a hopper barge will take place near Butterfly Bay, Tuen Mun, in the area defined by five WGS-84 positions. Work commenced with immediate effect from 23 March 2026 for approximately six months. Operations use a hopper barge with one tug and one guard boat, yellow marker buoys with yellow flashing lights and a 50 metre working zone around the hopper barge. Hours of work 0800-1900 (no work on Sundays and public holidays).

Type: Dredging / works · severity moderate
Feed: Offshore works, rigs and towingAll warnings of this kind on the map, or as an API feed.
Location: Butterfly Bay, Tuen Mun
Validity: From 23 Mar 2026, 00:00 UTC
Until 23 Sept 2026, 00:00 UTCWith immediate effect and for a period of approximately six months. The hours of work will be from 0800 to 1900 hours. No works will be carried out on Sundays and public holidays.
Activity periods: ? - ? (Daily 0800-1900 (times given in notice; treated as UTC for scheduling) excluding Sundays and public holidays)
Hazards: seabed reinstatement works, anchored hopper barge, anchor marker buoys with yellow flashing lights, work vessels (tug and guard boat)

Worked out automatically from the warning text on 30 Sept 2026, 11:18 UTC. It can be wrong: the official warning text is the authority.

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This warning's analysis also has:

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

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