Rena grounding on Astrolabe Reef | Novatug Maritime Wiki

Classification

Incident Type: Grounded
Severity: High
Tug involvement: Not reported
Tug mechanism: Not reported.

Vessel Details

Field	Value
Vessel Name	Rena
Vessel Type	Container
Flag State	Liberia [LR]
IMO Number
Gross Tonnage
LOA (m)
Year Built
Owner/Operator
Crew Size

Incident Details

Field	Value
Date	2011-10-05
Location	Astrolabe Reef, Bay of Plenty, New Zealand
Coordinates	-37.5400, 176.4300
Region	Pacific Ocean
Fatalities	0
Injuries	0
Missing
Cargo Loss	Substantial container cargo was lost.
Direct Damage	Severe hull damage and hull-girder failure; the aft section sank, the vessel was a total loss, about 200 tonnes of heavy fuel oil were lost, and substantial container cargo was lost.
Economic Damage

Key facts

Rena departed Napier at 10:20 on 4 October 2011 bound for Tauranga and grounded on Astrolabe Reef at about 02:14 on 5 October.
The vessel’s planned clearance from the reef was reduced from two nautical miles to one mile before a series of course changes and an overcorrection put it on a direct track toward the reef.
The hull was severely damaged, the hull girder failed, the vessel broke in two, and the aft section sank.
About 200 tonnes of heavy fuel oil and substantial container cargo were lost; Rena was declared a total loss.
TAIC found that the grounding was not caused by machinery or navigation-equipment failure.

Narrative

Rena departed Napier at 10:20 on 4 October 2011 bound for Tauranga. The master initially estimated the arrival time without fully accounting for unfavourable coastal currents. After the vessel made slower progress, he authorised the bridge watchkeepers to deviate from the planned course lines to shorten the passage and search for less adverse current.

During the night, the second mate reduced the intended clearance past Astrolabe Reef from two nautical miles to one nautical mile and made a series of small course changes. An overcorrection placed Rena on a direct track toward the reef. When the master returned to the bridge, the handover provided virtually no information about the ship’s position, heading, or immediate navigation threats. Position monitoring had broken down, and the bridge team did not recognise the developing grounding risk in time.

At about 02:14 on 5 October, Rena grounded on Astrolabe Reef in the Bay of Plenty. The initial impact severely damaged the hull. The hull girder subsequently failed and the vessel broke into two sections; the aft section moved off the reef and sank. About 200 tonnes of heavy fuel oil escaped into the sea, substantial container cargo was lost, and the vessel was declared a total loss. No fatalities or injuries were reported.

The Transport Accident Investigation Commission found no machinery or navigation-equipment failure that caused the grounding. It identified poor passage planning, inadequate navigation watchkeeping, and ineffective transfer of control as direct contributing factors. The investigation also raised wider issues involving company oversight of the safety management system, transparency of standards-of-training auditing, the availability of coastal shipping data, and the use of virtual aids to navigation.

Sequence of events

Date/time	Event
2011-10-04 10:20 local	Rena departed Napier bound for Tauranga.
2011-10-05 about 02:14 local	Rena grounded on Astrolabe Reef.
2011-10-05 onward	The hull was severely damaged, later broke in two, and the aft section sank; oil and cargo were lost.

Contributing factors

Factor	Evidence status	Description
Passage-plan deviation	Confirmed finding	The bridge team deviated from the planned course lines to shorten the passage and seek less adverse current.
Reduced clearance and course corrections	Confirmed finding	The planned clearance past Astrolabe Reef was reduced from two nautical miles to one, followed by small course changes and an overcorrection toward the reef.
Navigation watchkeeping	Confirmed finding	Position monitoring and recognition of the developing grounding risk were inadequate.
Ineffective transfer of control	Confirmed finding	The handover to the master did not provide effective information about position, heading, or immediate hazards.

Investigation

The Transport Accident Investigation Commission completed its investigation into the grounding. It found that the casualty was not attributable to a malfunction of onboard machinery or navigation equipment. The direct contributing factors were failures in passage planning, navigation watchkeeping, and transfer of control. TAIC also identified wider safety-management, training-audit, coastal-data, and virtual-navigation-aid issues.

References

TAIC investigation report: Rena grounding on Astrolabe Reef