MDN 265/2025

Marine site investigation with jack-up barges at Deep Bay

ExpiredReceived 24 Dec 2025, 00:00 UTC

Warning text

Positions open on the map

MARINE DEPARTMENT NOTICE NO. 265/2025 (Marine Works) Marine Site Investigation at Deep Bay With immediate effect and for a period of approximately three months, marine site investigation works involving drilling of boreholes will be carried out at the following locations (WGS 84 Datum): (A) 22-29.02N 113-57.74E (B) 22-28.68N 113-58.06E (C) 22-28.49N 113-58.33E 2. The works will be carried out by three jack-up barges. One tugboat and one work 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 15 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 0800 to 1800 hours. No works will be carried out on Sundays and public holidays. Vessels employed for the works will stay in the works locations outside the hours of work. 5. Silt curtains, which are large pieces of netting to contain mud and sediments extending from the sea surface to the seabed, will be established at the works locations. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the extent of the silt curtains. 6. Vessels navigating in the vicinity should proceed with caution. 7. A drawing showing the works locations is attached to this Notice. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 24 December 2025 Action File Ref.: L/M. No. 45/25 in MD-PD&PS-F01-075-01A-003-P072

Location map

Open on the full map

Analysis

Expired

Cancelled by MDN 38/2026

Marine site investigation involving drilling of boreholes will be carried out at three positions in Deep Bay. Works by three jack-up barges, assisted by one tug and one work boat, will establish a 15 metre working area around each barge and deploy silt curtains and yellow marker buoys with yellow flashing lights. Hours of work 0800-1800 daily; no works on Sundays and public holidays. Notice dated 24 December 2025 states the works are for approximately three months.

Type: Survey operations · severity moderate
Feed: Survey operationsAll warnings of this kind on the map, or as an API feed.
Location: Deep Bay
Validity: From 24 Dec 2025, 00:00 UTC
With immediate effect and for a period of approximately three months. The hours of work will be from 0800 to 1800 hours. No works will be carried out on Sundays and public holidays.
Activity periods: 24 Dec 2025, 08:00 UTC - ? (Daily 0800-1800 hours; no works on Sundays and public holidays; works for approximately three months from 24 December 2025)
Hazards: jack-up barges, drilling of boreholes, silt curtains, marker buoys with flashing lights, work vessels (tug and work boat)

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