MDN 182/2025

Seabed reinstatement works near Butterfly Bay, Tuen Mun (approx. six months)

No longer in forceReceived 17 Sept 2025, 00:00 UTCArchived 30 Sept 2026, 12:45 UTC

Warning text

Positions open on the map

MARINE DEPARTMENT NOTICE NO. 182/2025 (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. Mr. Q. SHI Director of Marine (Acting) Marine Department Government of the HKSAR Date: 17 September 2025 Action File Ref.: L/M No. 21/25 in MD-PD&PS-F01-075-01A-003-P067

Location map

Open on the full map

Analysis

No longer in force

Seabed reinstatement works will be carried out near Butterfly Bay, Tuen Mun from 17 September 2025 for approximately six months. Works will be carried out by a hopper barge with one tug and one guard boat; a working area of approximately 50 metres around the hopper barge will be established and yellow marker buoys with yellow flashing lights will mark anchors. Working hours are 0800-1900 daily, with no works on Sundays and public holidays. Vessels in the vicinity should proceed with caution.

Type: Offshore operations · 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 17 Sept 2025, 00:00 UTC
Until 17 Mar 2026, 19:00 UTCWith immediate effect and for a period of approximately six months; hours of work 0800 to 1900 hours. No works on Sundays and public holidays.
Activity periods: 17 Sept 2025, 08:00 UTC - 17 Mar 2026, 19:00 UTC (daily 0800-1900, no works on Sundays and public holidays)
Hazards: seabed reinstatement works, hopper barge and tugs, anchor lines and marker buoys, working area (obstruction to navigation)

Worked out automatically from the warning text on 30 Sept 2026, 11:41 UTC. It can be wrong: the official warning text is the authority.

The whole analysis comes with Lagom

This warning's analysis also has:

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

The action for mariners, the keep-clear distance, contacts, ships named, translations and the nearby lights and rescue centres come with Lagom and every higher plan, and with the API plans. The official warning text above is always free.

See the plans

Back to Hong Kong