MDN 72/2025

Marine site investigation north of West Lamma Fairway using jack-up barges

No longer in forceReceived 11 Apr 2025, 00:00 UTCArchived 30 Sept 2026, 12:45 UTC

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MARINE DEPARTMENT NOTICE NO. 72/2025 (Marine Works) Marine Site Investigation to the North of West Lamma Fairway With immediate effect and for a period of approximately 12 months, marine site investigation works involving 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 (H): (A) 22-16.82N 114-05.53E (B) 22-16.54N 114-05.76E (C) 22-16.34N 114-05.53E (D) 22-16.35N 114-05.74E (E) 22-15.76N 114-05.47E (F) 22-15.74N 114-04.87E (G) 22-15.22N 114-04.29E (H) 22-15.33N 114-03.78E 2. The works will be carried out by four jack-up barges. 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 25 metres around each jack-up barge will be established. Yellow flashing lights will be installed at the four corners of each jack-up barge to indicate its position. 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: 11 April 2025 Action File Ref.: L/M. No. 13/25 in MD-PD&PS-F01-075-01A-003-P065

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Analysis

No longer in force

Marine site investigation involving drilling of boreholes will be carried out in an area north of West Lamma Fairway. Works are carried out by four jack-up barges with two assisting tugboats; a 25 metre working area is established around each barge. Hours of work are 0700-1900 daily, with no works on Sundays and public holidays. The notice states works to last for approximately 12 months from issue.

Type: Survey operations · severity moderate
Feed: Survey operationsAll warnings of this kind on the map, or as an API feed.
Location: North of West Lamma Fairway (area bounded by coordinates A to H)
Validity: From 11 Apr 2025, 00:00 UTC
Until 11 Apr 2026, 00:00 UTCWith immediate effect and for a period of approximately 12 months
Activity periods: ? - ? (Daily 0700-1900 hours; no works on Sundays and public holidays (working period approx 12 months from 11 Apr 2025))
Hazards: drilling of boreholes, jack-up barges, tug assistance, 25 m working/safety zone around each barge, yellow flashing lights at barge corners

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

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