MDN 236/2025

Marine site investigation southeast of Lantau Island - approx six months from 17 Nov 2025

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

Warning text

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MARINE DEPARTMENT NOTICE NO. 236/2025 (Marine Works) Marine Site Investigation off Southeast of Lantau Island With immediate effect and for a period of approximately six months, marine site investigation works involving drilling of boreholes and cone penetration tests will be carried out within the area bounded by straight lines joining the following co-ordinates (WGS 84 Datum) from (A) to (H): (A) 22-18.43N 114-04.59E (B) 22-17.55N 114-05.02E (C) 22-17.28N 114-05.80E (D) 22-17.09N 114-05.89E (E) 22-16.88N 114-04.49E (F) 22-17.22N 114-03.65E (G) 22-17.82N 114-03.60E (H) 22-18.28N 114-04.13E 2. The works will be carried out by five jack-up barges, three flat top barges and two dumb lighters. Three tugboats 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 50 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 the flat top barges and lighters. 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 2300 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. This Notice supersedes Marine Department Notice No. 12/2025. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 17 November 2025 Action File Ref.: L/M. No. 35/23 in MD-PD&PS-F01-075-01A-003-P051

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Analysis

No longer in force

Marine site investigation including borehole drilling and cone penetration tests off southeast Lantau Island. Works by multiple barges, lighters and tugs within a defined polygon; 50 m working zone around each barge/lighter marked by yellow buoys and lights. Working hours 0700-2300 (no works on Sundays and public holidays). This notice supersedes Marine Department Notice No. 12/2025.

Type: Survey operations · severity moderate
Feed: Survey operationsAll warnings of this kind on the map, or as an API feed.
Location: Off southeast of Lantau Island (area bounded by listed coordinates)
Validity: From 17 Nov 2025, 00:00 UTC
Until 17 May 2026, 00:00 UTCWith immediate effect and for a period of approximately six months. Hours of work 0700 to 2300 hours. No works on Sundays and public holidays.
Activity periods: 17 Nov 2025, 07:00 UTC - 17 May 2026, 23:00 UTC (Daily 0700-2300 (times given as hours in notice; no works on Sundays and public holidays))
Hazards: marine site investigation, drilling of boreholes, cone penetration tests, anchored barges and lighters, marker buoys with lights
Cancels: Marine Department Notice No. 12/2025

Worked out automatically from the warning text on 30 Sept 2026, 11:38 UTC. It can be wrong: the official warning text is the authority.

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

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