MDN 203/2025

Marine site investigation at Lung Kwu Tan with 50m working area and marker buoys

ExpiredReceived 13 Oct 2025, 00:00 UTC

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MARINE DEPARTMENT NOTICE NO. 203/2025 (Marine Works) Marine Site Investigation at Lung Kwu Tan With immediate effect and for a period of approximately five months, marine site investigation works involving drilling of vibrocores will be carried out within the area bounded by straight lines joining the following co-ordinates (WGS 84 Datum) from (A) to (D) and the adjacent shoreline: (A) 22-22.81N 113-55.18E (B) 22-23.47N 113-54.33E (C) 22-23.70N 113-54.57E (D) 22-23.16N 113-55.25E 2. The works will be carried out by one flat-top barge. Two tugboats 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 flat-top 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 0700 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. 5. Vessels navigating in the vicinity should proceed with caution. 6. A drawing showing the works area is attached to this Notice. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 13 October 2025 Action File Ref.: L/M. No. 31/25 in MD-PD&PS-F01-075-01A-003-P069

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Analysis

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Marine site investigation (vibrocore drilling) is being carried out at Lung Kwu Tan inside the area bounded by four given positions. Works commenced with immediate effect from 13 October 2025 and will continue for approximately five months. Activity is by a flat-top barge with two tugboats; a working area of approximately 50 metres around the barge will be established and yellow marker buoys with yellow flashing lights will mark anchor positions. Work hours are 0700-1900 daily, with no works on Sundays and public holidays; vessels should proceed with caution.

Type: Survey operations · severity moderate
Feed: Survey operationsAll warnings of this kind on the map, or as an API feed.
Location: Lung Kwu Tan
Validity: From 13 Oct 2025, 00:00 UTC
With immediate effect and for a period of approximately five months
Activity periods: ? - ? (Hours of work 0700-1900 (hours given in notice; treated as UTC). No works on Sundays and public holidays.)
Hazards: marine site investigation (vibrocore drilling), working vessels (flat-top barge and tugs), anchors and marker buoys, restricted working area (50 m)

Worked out automatically from the warning text on 30 Sept 2026, 11:40 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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