MDN 89/2025

SÉCURITÉ

Dredging and borehole drilling at Nim Wan, Deep Bay (approx. 12 months from 28 Apr 2025)

No longer in forceReceived 28 Apr 2025, 00:00 UTCArchived 30 Sept 2026, 12:45 UTC

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MARINE DEPARTMENT NOTICE NO. 89/2025 (Marine Works) Marine Works at Nim Wan, Deep Bay With immediate effect and for a period of approximately 12 months, marine works involving dredging operations and drilling of boreholes will be carried out within the area bounded by straight lines joining the following co- ordinates (WGS 84 Datum) from (A) to (P) and the adjacent shorelines: (A) 22-25.23N 113-54.82E (B) 22-25.30N 113-54.82E (C) 22-25.35N 113-54.77E (D) 22-25.41N 113-55.09E (E) 22-25.48N 113-55.37E (F) 22-25.48N 113-55.57E (G) 22-25.56N 113-55.82E (H) 22-25.55N 113-55.95E (I) 22-25.61N 113-56.11E (J) 22-25.68N 113-56.09E (K) 22-25.71N 113-56.18E (L) 22-25.59N 113-56.22E (M) 22-25.46N 113-55.81E (N) 22-25.47N 113-55.81E (O) 22-25.42N 113-55.59E (P) 22-25.41N 113-55.59E 2. The works will be carried out by two jack-up barges, two dumb lighters and one flat-top barge. Two tugboats, one hopper barge and one work boat will provide assistance. The number of vessels engaged in the works will change from time to time to suit operational requirements. Vessels engaged in the works will display signals as prescribed in international and local regulations. 3. A working area of approximately 30 metres will be established around each barge and lighter. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the positions of the anchors extending from each flat-top barge and lighter. Yellow flashing lights will be installed at the four corners of each jack-up barge to indicate its position. 4. Silt curtains which are large pieces of netting to contain mud and sediments extending from the sea surface to the seabed, will be established within the works area. Yellow flashing lights will be laid to mark the extent of the silt curtains. 5. 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 stay in the works area outside the hours of work. 6. Vessels navigating in the vicinity should proceed with caution. 7. A drawing showing the works area is attached to this Notice. This Notice should be read in conjunction with Marine Department Notice No. 137/2024. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 28 April 2025 Action File Ref.: L/M. No.12/25 in MD-PD&PS-F01-075-01A-003-P065

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Analysis

No longer in force

Cancelled by MDN 227/2025

Marine works (dredging and borehole drilling) are taking place at Nim Wan, Deep Bay within the polygon defined by coordinates A-P and adjacent shorelines. Activity commenced with immediate effect on 28 April 2025 and will continue for approximately 12 months. Work hours are 0800-1900 daily; no works on Sundays and public holidays. A 30 metre working area will be established around each barge/lighter, marked by yellow buoys and flashing lights; silt curtains will also be deployed.

Type: Dredging / works · severity moderate
Feed: Offshore works, rigs and towingAll warnings of this kind on the map, or as an API feed.
Location: Nim Wan, Deep Bay (Hong Kong)
Validity: From 28 Apr 2025, 00:00 UTC
Until 28 Apr 2026, 00:00 UTCWith immediate effect and for a period of approximately 12 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: 28 Apr 2025, 08:00 UTC - 28 Apr 2026, 19:00 UTC (Daily 0800-1900 (no works on Sundays and public holidays))
Hazards: dredging operations, borehole drilling, jack-up barges and work vessels, anchors and anchor chains, marker buoys with flashing lights, silt curtains

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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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.

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Keywordsdredging operations

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