Underwater operations in progress until 12 sep by M/V thalassa along trackline between 27-36N 016-00W and…
North Atlantic Ocean · HYDROLANT 1884/12
What this record establishes
Archived notice · 2012-08-25 09:55Z
This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.
- Source and dates
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · NAVAREA II 272/12 161542Z AUG 12.. Issued 2012-08-16 16:33Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- North Atlantic Ocean. The map shows the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.
Current notices and reporting history in the North Atlantic Ocean →
- issued
- 2012-08-16 16:33Z
- status
- Archived notice
- authority
- NAVAREA II 272/12 161542Z AUG 12.
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- North Atlantic Ocean
- position
- 26.800, -25.500
- vessel
- M/V THALASSA · 139 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN NORTH ATLANTIC. 1. UNDERWATER OPERATIONS IN PROGRESS UNTIL 12 SEP BY M/V THALASSA ALONG TRACKLINE BETWEEN 27-36N 016-00W AND 26-00N 035-00W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 13 SEP 12.
Reading this warning
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- Track line joining
- Introduces a route through a series of positions — a cable route, a tow's track or a survey line.
- Position (degrees and minutes)
- How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
- Wide berth requested
- Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Collected reports in this area · survey operations
5 within 180 nm since 2001 · 0 in the last 12 months · 0 listed in force now
Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.
- Underwater operations 27 thru 30 jan by M/V pourquoi pas along trackline between 28-09N 015-25W and 25-14N…2018-01-23
- Oceanographic operations 060001Z dec to 242359Z jan 16 by M/V discovery along trackline joining 24-30.37N…2015-12-04
- Underwater operations in progress until 12 sep by M/V thalassa along trackline between 27-36N 016-00W and…2012-08-16
- Oceanographic operations 19 april thru 08 may by M/V poseidon vicinity of trackline joining 29-00N 015-30W,…2001-04-18
Month of issue in the collected archive
All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.
Nearby notices listed in force · within 120 nm
No other collected notice is currently listed in force within this radius. This does not establish safe conditions.
Worldwide in the collected sources
55 survey operations listed in force · see all
Record snapshot 2026-10-02 07:44Z; source collection times vary.
Surveys
Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →
Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.