Submarine unreported
South Atlantic Ocean · HYDROLANT 3801/17
What this record establishes
Archived notice · 2017-11-30 03:51Z
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 VI 705/17 242148Z NOV 17.. Issued 2017-11-24 21:47Z. 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 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
- Submarine unreportedcancelled by this notice
- Submarine unreportedcancelled by this notice
- Submarine unreportedlater cancellation notice
These reports were linked by category and sea, with positions within 30 nautical miles and issue dates within 30 days of another report's recorded in-force span. Links can extend through other members, so the full group can cover a larger area or period. Proximity does not confirm that they describe one incident.
- HYDROLANT 3720/172017-11-18 · Archived notice
- HYDROLANT 3780/172017-11-23 · Archived notice
- HYDROLANT 3801/17 · this notice2017-11-24 · Archived notice
- HYDROLANT 3865/172017-11-30 · Archived notice
- HYDROLANT 3879/172017-12-01 · Archived notice
- HYDROLANT 4129/172017-12-20 · Archived notice
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2017-11-24 21:47Z
- status
- Archived notice
- authority
- NAVAREA VI 705/17 242148Z NOV 17.
- NAVAREA
- NAVAREA VI · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -43.642, -59.181
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN SOUTH ATLANTIC. DNC 07. 1. SUBMARINE UNREPORTED. SEARCH AND RESCUE OPERATIONS IN AREA BOUND BY 41-00S 060-00W, 47-30S 062-30W, 47-30S 060-07W, 40-00S 055-00W. VESSELS IN VICINITY REQUESTED TO KEEP A SHARP LOOKOUT, ASSIST IF POSSIBLE. REPORTS TO MRCC PUERTO BELGRANO, INMARSAT-C: 470100125, PHONE: 5429 3248 7150, 5429 3248 7162. 2. NAVIGATION PROHIBITED IN AREA BETWEEN 45-00S 46-50S AND 060-30W 059-00W. 3. CANCEL HYDROLANT 3720/17, 3780/17.
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.
- 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.
- Keep a sharp lookout
- A request to every ship in the area to watch for the vessel, people or object described.
- Assist if possible
- The second half of the standard rescue request: ships able to help are asked to do so.
- MRCC (Maritime Rescue Coordination Centre)
- A rescue coordination centre for maritime cases only, such as MRCC Fort-de-France or MRCC Vietnam.
- Inmarsat-C / SafetyNET
- The satellite system that carries NAVAREA warnings to ships at sea, and the terminal number rescue centres give for reports.
- Navigation prohibited
- Ships may not enter or pass through the area, or a port is closed to traffic.
- 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.
Collected reports in this area · distress & casualty cases (archived)
16 within 180 nm since 2005 · 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.
- Search and rescue operations in vicinity 46-24S 060-41W2019-02-15
- Search and rescue operations in progress until further notice by M/V seabed constructor in area bound by…2018-10-23
- Search and rescue operations in progress until further notice by M/V seabed constructor in area bound by…2018-09-07
- F/V dorneda sank in 45-01S 060-04W2018-07-12
- Distress signal received on 406 mhz from F/V dorneda in 45-01.32S 060-04.80W2018-07-11
- Search and rescue operations: a. by vessels towing equipment in area bound by 45-55S 059-40W, 45-55S…2018-03-03
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
0 distress & casualty cases (archived) listed in force · see all
Record snapshot 2026-10-02 13:02Z; source collection times vary.
Incidents
Search-and-rescue broadcasts, published only once a case has been closed for 30 days: groundings, sinkings, capsizes, fires, man overboard, overdue vessels. Nothing here is live. All current distress & casualty cases (archived) →
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.