Underwater operations 1100Z to 2100Z daily 19 thru 24 apr by cableship intrepid in 20-22.45S 040-11.23W
South Atlantic Ocean · HYDROLANT 1066/21
What this record establishes
Archived notice · 2021-04-24 22:00Z
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 V COASTAL E 281/21 182016Z APR 21.. Issued 2021-04-18 21:00Z. 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
- South Atlantic Ocean. The parsed report position is -20.374, -40.187. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Current notices and reporting history in the South Atlantic Ocean →
Activity windows · 6 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2021-04-19 11:00Z | 2021-04-19 21:00Z | — | 10 h |
| 2021-04-20 11:00Z | 2021-04-20 21:00Z | — | 10 h |
| 2021-04-21 11:00Z | 2021-04-21 21:00Z | — | 10 h |
| 2021-04-22 11:00Z | 2021-04-22 21:00Z | — | 10 h |
| 2021-04-23 11:00Z | 2021-04-23 21:00Z | — | 10 h |
| 2021-04-24 11:00Z | 2021-04-24 21:00Z | — | 10 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2021-04-18 21:00Z
- status
- Archived notice
- self-cancels
- 2021-04-24 22:00Z
- authority
- NAVAREA V COASTAL E 281/21 182016Z APR 21.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V COASTAL E
- sea
- South Atlantic Ocean
- position
- -20.374, -40.187
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN SOUTH ATLANTIC. BRAZIL-SOUTHEAST COAST. DNC 01. 1. UNDERWATER OPERATIONS 1100Z TO 2100Z DAILY 19 THRU 24 APR BY CABLESHIP INTREPID IN 20-22.45S 040-11.23W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 242200Z APR 21.
Reading this warning
- DNC (Digital Nautical Chart)
- A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- Cable operations
- A ship is laying, burying or repairing a submarine cable, usually along a stated route.
- 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.
- Date-time group (DTG)
- A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
Collected reports in this area · cable & pipeline work
1156 within 180 nm since 1998 · 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.
- Cable operations in progress until 03 feb 25 by cableship bold maverick in: a. 22-11.33S 041-06.38W2024-09-05
- Seismic survey in progress until 23 apr by nps sigma in area bound by 21-10.6S 039-55.5W, 21-10.5S…2016-04-12
- Seismic survey 10 thru 16 apr by nps sigma in area bound by 21-19.4S 039-57.5W, 21-17.3S 039-57.5W, 21-11.2S…2016-04-09
- Seismic survey in progress until 09 apr by M/V nps sigma in area bound by 21-00.6S 039-44.0W, 21-11.4S…2016-04-01
- Seismic survey 26 mar thru 02 apr by M/V nps sigma in area bound by 21-00.6S 039-44.0W, 21-11.4S 039-39.3W,…2016-03-27
- Seismic survey 19 thru 26 mar by M/V nps sigma in area bound by 21-19.07S 039-57.08W, 21-17.05S 039-57.08W,…2016-03-18
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
Worldwide in the collected sources
23 cable & pipeline work listed in force · see all
Record snapshot 2026-09-24 20:22Z; 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.