Almost 12 years on, the search for Malaysia Airlines Flight 370 is the most extensive and complex in aviation history with only 60 pieces of debris found.
The search has covered approximately 7.72 million square kilometres of ocean and seabed since the aircraft disappeared on 8 March 2014.
The Boeing 777 vanished while en route from Kuala Lumpur to Beijing with 239 people on board. Initial search efforts focused on the South China Sea after the aircraftโs transponder signal was lost near waypoint IGARI. Within hours, multiple nations launched search-and-rescue operations based on the assumption the aircraft had suffered a catastrophic failure along its planned route.
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According to the Australian Transport Safety Bureau (ATSB), 14 countries participated in the initial search east of Malaysia. A total of 28 aircraft and 24 vessels combed approximately 573,000 square kilometres.
When military radar data revealed the aircraft had turned west across the Malay Peninsula, the search area expanded dramatically. Between 8 and 15 March 2014, 36 aircraft and 35 vessels from 12 countries searched 4.6 million square kilometres west of Malaysia.
Attention then shifted to the southern corridor of the Indian Ocean after satellite data indicated the aircraft had flown for several hours before fuel exhaustion. Between 18 and 23 March, eight aircraft from six countries searched 1.63 million square kilometres south of Indonesia.
Australia assumed coordination of the search within its search-and-rescue region on 17 March 2014 at Malaysiaโs request.
From March to April 2014, 334 search flights were conducted over the southern Indian Ocean. Approximately 4.6 million square kilometres of ocean surface were scanned, with around 60 vessels participating at various stages.
Aircraft typically required four hours to reach the search zone, two hours on station, and four hours to return, limiting effective search time.
Despite extensive aerial and maritime operations, no confirmed floating wreckage was located during the surface phase.
Before a deep-water search could begin, large sections of the seabed in the priority zone had to be mapped. Existing charts were based largely on satellite-derived estimates and were insufficient for autonomous underwater vehicle (AUV) operations.
Between May 2014 and early 2015, the ATSB conducted a bathymetric survey covering approximately 710,000 square kilometres. Multi-beam echo sounders revealed a complex seabed featuring escarpments, seamounts, volcanic ridges and underwater canyons exceeding 6,000 metres in depth.
The formal underwater search began in October 2014 and continued until January 2017. Specialist vessels including Fugro Discovery, Fugro Equator, Fugro Supporter, GO Phoenix and the Chinese vessel Dong Hai 101 deployed towed side-scan sonar and AUV systems.
By 17 January 2017, 120,000 square kilometres of seabed had been searched in high resolution. The governments of Australia, Malaysia and China jointly announced the suspension of the official search after no wreckage was found within the defined priority zone.
In 2018, Malaysia accepted a โno find, no feeโ proposal from Ocean Infinity to resume the search. Under the agreement, the company would be paid only if it located the aircraft within agreed contract terms, with reported compensation capped at approximately US$70 million.
Ocean Infinity deployed the vessel Seabed Constructor, operating eight HUGIN AUVs built by Kongsberg Maritime. The vehicles were capable of operating at depths of up to 6,000 metres and carried side-scan sonar, synthetic aperture sonar, multi-beam echo sounders, sub-bottom profilers, cameras and magnetometers.
Between January and May 2018, Ocean Infinity searched and collected data over 112,000 square kilometres of seabed โ significantly exceeding its initial 25,000 square kilometre target. No wreckage was located.
The combined government and private underwater search area subsequently reached 232,000 square kilometres.
Ocean Infinity returned to the southern Indian Ocean in 2025 using the vessel Armada 7806. The company extended bathymetric mapping and expanded the search area up to 50 nautical miles from the seventh satellite arc, adding 7,400 square kilometres.
A further 7,650 square kilometres were searched in 2026.
The total underwater search area now approaches 250,000 square kilometres, while cumulative surface search, seabed mapping and underwater operations amount to approximately 7.72 million square kilometres โ an area comparable to the size of Australia and larger than the European Union.
Industry analysts say renewed search activity will depend on weather windows offering several weeks of stable operating conditions. Ocean Infinity has indicated willingness to resume operations when feasible, and other private-sector groups have expressed interest in continuing the search if required.
Twelve years after its disappearance, Malaysia Airlines Flight 370 remains one of aviationโs greatest unsolved mysteries. Investigators and search specialists maintain that advances in deep-ocean technology and refined drift and satellite analysis models mean the aircraft may yet be found.
