Cable ops

Seismic survey 31 dec thru 28 feb 12 by M/V oceanic challenger towing ten 7500 meter long cables in area…

Adriatic Sea · HYDROLANT 2295/11

What this record establishes

Archived notice · 2012-02-21 16:20Z

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 520/11 31 DEC 11.. Issued 2011-12-31 13:55Z. 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
Adriatic Sea. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Adriatic Sea →

issued
2011-12-31 13:55Z
status
Archived notice
authority
NAVAREA III 520/11 31 DEC 11.
NAVAREA
NAVAREA III · named as the source of this relay
sea
Adriatic Sea
position
42.568, 17.173
vessel
M/V OCEANIC CHALLENGER · 21 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

ADRIATIC SEA.
1. SEISMIC SURVEY 31 DEC THRU 28 FEB 12
   BY M/V OCEANIC CHALLENGER TOWING TEN
   7500 METER LONG CABLES IN AREA BOUND BY
   42-21.2N 016-28.2E, 42-34.0N 018-01.0E,
   42-15.2N 018-26.4E, 42-41.1N 018-00.3E,
   42-43.0N 016-28.5E.
   SIX MILE BERTH REQUESTED.
2. CANCEL THIS MSG 29 FEB 12.

Reading this warning

Seismic survey
A survey that maps the rock beneath the seabed with sound pulses from air guns, recorded on streamers kilometres long.
Towed array / streamer
Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
Tow / towing
A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
Area bound by
Introduces a list of positions that are the corners of an area — the polygon the warning applies to.
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.

All warning terms →

Collected reports in this area · cable & pipeline work

20 within 180 nm since 1999 · 0 in the last 12 months · 0 listed in force now

99
00
05
10
15
20

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

No other collected notice is currently listed in force within this radius. This does not establish safe conditions.

Worldwide in the collected sources

24 cable & pipeline work listed in force · see all

Record snapshot 2026-10-02 01:29Z; source collection times vary.

Cable ops

Cable laying, pipeline and seismic operations. All current cable & pipeline work →

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.