Surveys

Underwater operations in progress until 24 mar 13 by M/V deep blue and M/V alesta dalgiclik vicinity of…

Sea of Marmara · HYDROLANT 2123/12

What this record establishes

Archived notice · 2013-03-25 00:01Z

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 III 375/12 131201Z SEP 12 - NAVAREA XIX 109/12 131125Z SEP 12.. Issued 2012-09-13 12:44Z. 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
Sea of Marmara. The map shows the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Sea of Marmara →

issued
2012-09-13 12:44Z
status
Archived notice
authority
NAVAREA III 375/12 131201Z SEP 12 - NAVAREA XIX 109/12 131125Z SEP 12.
NAVAREA
NAVAREA III · named as the source of this relay
sea
Sea of Marmara
position
40.893, 28.953
vessels
M/V ALESTA DALGICLIK · 2 messagesM/V DEEP BLUE · 4 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

SEA OF MARMARA.
1. UNDERWATER OPERATIONS IN PROGRESS UNTIL 24 MAR 13
   BY M/V DEEP BLUE AND M/V ALESTA DALGICLIK
   VICINITY OF TRACKLINE JOINING
   40-57.89N 028-41.43E, 40-56.74N 028-42.33E,
   40-55.51N 028-50.89E, 40-53.82N 028-57.80E,
   40-50.01N 029-07.13E, 40-50.76N 029-11.13E,
   40-51.25N 029-13.18E. WIDE BERTH REQUESTED.
2. CANCEL HYDROLANT 2069/12(43).
3. CANCEL HYDROLANT 2021/12.
4. CANCEL THIS MSG 25 MAR 13.

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.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROLANT
The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
CANCEL THIS MSG
The warning's own expiry: a line telling the reader when the message cancels itself.

All warning terms →

Collected reports in this area · survey operations

134 within 180 nm since 1999 · 9 in the last 12 months · 5 listed in force now

99
00
05
10
15
20
25
26

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.

Month of issue in the collected archive

J
F
M
A
M
J
J
A
S
O
N
D

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

Worldwide in the collected sources

54 survey operations listed in force · see all

Record snapshot 2026-09-28 21:41Z; 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.