Underwater operations are underway by vessel Investigator in Bass Strait, Australia, within a defined area; one mile berth requested.
Bass Strait · HYDROPAC 1571/24
What this record establishes
Cancelled notice · 2026-08-14 18:10Z
This notice disappeared from the issuing source's in-force list. No explicit recovery or all-clear is established by that removal.
- Source and dates
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · AUSCOAST 154/24 101452Z MAY 24.. Issued 2024-05-10 15:15Z. First collected 2026-08-17 13:41Z; last seen in collection 2026-08-17 15:50Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- Bass Strait. 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
- issued
- 2024-05-10 15:15Z
- status
- Cancelled notice
- authority
- AUSCOAST 154/24 101452Z MAY 24.
- issued by
- AUSCOAST
- sea
- Bass Strait
- position
- -38.425, 148.633
- vessel
- M/V INVESTIGATOR · 30 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:41Z
Original warning text
BASS STRAIT. AUSTRALIA. DNC 05. 1. UNDERWATER OPERATIONS IN PROGRESS UNTIL FURTHER NOTICE BY M/V INVESTIGATOR IN AREA BOUND BY 37-57.00S 148-13.00E, 38-54.00S 148-13.00E, 38-54.00S 149-03.00E, 37-57.00S 149-03.00E. ONE MILE BERTH REQUESTED. 2. CANCEL HYDROLANT 1564/24.
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.
- Until further notice
- The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
- 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.
- 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 · survey operations
102 within 180 nm since 2001 · 3 in the last 12 months · 2 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.
- Special purpose vessel samson explorer / VNW5773 / 503096000 conducting underwater operations in an area…2026-09-30
- Drill rig valaris 107/A8GS5 in position 38-17.79S 147-40.57E 2.5 nm clearance requested2026-08-20
- Underwater operations in progress until further notice by M/V pmg emerald in area bound by 39-01.29S…2026-02-12
- Underwater operations in progress until further notice by M/V investigator along trackline joining 37-57.00S…2024-05-10
- Sub-surface scientific moorings established in: a. 38-07.56S 147-31.92E2024-03-04
- Underwater operations in progress until further notice by M/V samson explorer towing 900 meter long cables…2024-02-23
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
55 survey operations listed in force · see all
Record snapshot 2026-09-30 15:16Z; 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.