Surveys

Underwater operations 052000Z to 172000Z aug by submersible alvin and vessel atlantis in area within 60…

Caribbean Sea · NAVAREA IV 757/22

What this record establishes

Archived notice · 2022-08-17 21:00Z

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) · WHOI 0/22 021902Z AUG 22.. Issued 2022-08-02 21:25Z. 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
Caribbean Sea. The parsed report position is 18.500, -81.500 with a 60.0 nm radius. 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 Caribbean Sea →

Activity windows · 1 in this warning

opens (UTC)closes (UTC)locallength
2022-08-05 20:00Z2022-08-17 20:00Z—288 h

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

issued
2022-08-02 21:25Z
status
Archived notice
self-cancels
2022-08-17 21:00Z
authority
WHOI 0/22 021902Z AUG 22.
NAVAREA
NAVAREA IV
issued by
WHOI
sea
Caribbean Sea
position
18.500, -81.500 · r 60.0 nm
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN CARIBBEAN SEA.
CAYMAN ISLANDS.
1. UNDERWATER OPERATIONS 052000Z TO 172000Z AUG
   BY SUBMERSIBLE ALVIN AND VESSEL ATLANTIS
   IN AREA WITHIN 60 MILES OF 18-30.00N 081-30.00W.
2. CANCEL THIS MSG 172100Z AUG 22.

Reading this warning

Underwater operations
Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
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.
Within a radius of
A circular area — every position within a stated distance of a point.
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.
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

27 within 180 nm since 2021 · 1 in the last 12 months · 0 listed in force now

21
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

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

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-04 00:39Z; 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.