MDN 59/2025

SÉCURITÉ

Submarine outfall construction and silt curtain at Po Toi O, approx 21 months

Activeuntil 21 Dec 2026, 00:00 UTC (in 36 days)Received 21 Mar 2025, 00:00 UTC

Warning text

Positions open on the map

MARINE DEPARTMENT NOTICE NO. 59/2025 (Marine Works) Submarine Outfall Construction Works at Po Toi O With immediate effect and for a period of approximately 21 months, submarine outfall construction works will be carried out within the area bounded by straight lines joining the following co-ordinates (WGS 84 Datum) from (A) to (L) and the adjacent shoreline: (A) 22-16.62N 114-17.81E (B) 22-16.62N 114-17.81E (C) 22-16.62N 114-17.82E (D) 22-16.82N 114-17.82E (E) 22-16.82N 114-17.81E (F) 22-16.84N 114-17.81E (G) 22-16.84N 114-17.83E (H) 22-16.82N 114-17.83E (I) 22-16.82N 114-17.82E (J) 22-16.63N 114-17.82E (K) 22-16.63N 114-17.82E (L) 22-16.63N 114-17.83E 2. The works will be carried out by three dumb lighters and one hopper barge. Two tugs 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 around each lighter and the 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 lighters and the barge. 4. A silt curtain which is a large piece of netting to contain mud and sediments extending from the sea surface to the seabed will be established within the works area. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the extent of the silt curtain. 5. 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. 6. Diving operations will be carried out from time to time during the hours of work. Vessels navigating in the vicinity should proceed with caution and keep clear of the works area at slow speed, bearing in mind there are divers working in the area. 7. A drawing showing the works area is attached to this Notice. This Notice is an extension of Marine Department Notice No. 147/2023. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 21 March 2025 Action File Ref.: L/M No. 36/23 in MD-PD&PS-F01-075-01A-001A-P052

Location map

Open on the full map

Analysis

Activeuntil 21 Dec 2026, 00:00 UTC (in 36 days)

Submarine outfall construction works are underway at Po Toi O from 21 March 2025 for approximately 21 months. Works use three dumb lighters, one hopper barge and two tugs, with anchored positions and a silt curtain marked by yellow marker buoys with yellow flashing lights. Daily working hours are 0700-1900 (no works on Sundays and public holidays); diving operations will occur from time to time during working hours. Vessels should keep clear and proceed with caution at slow speed.

Type: Dredging / works · severity moderate
Feed: Offshore works, rigs and towingAll warnings of this kind on the map, or as an API feed.
Location: Po Toi O
Validity: From 21 Mar 2025, 00:00 UTC
Until 21 Dec 2026, 00:00 UTCWith immediate effect and for a period of approximately 21 months. Hours of work 0700 to 1900 hours. No works on Sundays and public holidays.
Activity periods: ? - ? (Daily 0700-1900 (hours as given). No works on Sundays and public holidays; vessels employed will remain in area outside hours.)
Hazards: submarine outfall construction, anchored construction vessels, silt curtain, diving operations, marker buoys

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.

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

Keywordsdiving operations divers working keep clear of

Back to Hong Kong