Investigations are continuing into the “suspected hijacking” of an oil tanker off the Isle of Wight which ended when British forces stormed the vessel.
Seven people were detained on Sunday evening when stowaways on board the Liberian-registered Nave Andromeda reportedly became violent.
About 16 members of the Special Boat Service (SBS) ended the tense ten-hour standoff in a nine-minute operation.
All 22 crew members, who were locked in the ship’s citadel, are safe.
“When it was dark the 16 strong SBS team flew by four Royal Navy helicopters and quickly descended onto the vessel by rope,” said BBC Defence Correspondent Jonathan Beale.
“The seven stowaways – believed to be Nigerians seeking asylum in the UK – were detained and handed over to Hampshire Police,” he added.
The Ministry of Defence called the incident a “suspected hijacking” and said Defence Secretary Ben Wallace and Home Secretary Priti Patel authorised the operation in response to a police request.
Mr Wallace said: “In dark skies, and worsening weather, we should all be grateful for our brave personnel. People are safe tonight thanks to their efforts.”
Mrs Patel tweeted she was “thankful for the quick and decisive action of our police and armed forces who were able to bring this situation under control, guaranteeing the safety of all those on board”.
Mr Beale said the individuals were detained after they were met with “overwhelming force”.
He said along with the SBS squad from Poole, in Dorset, a team of Royal Navy divers were also deployed in one of the Royal Navy helicopters in case the vessel had been mined – but it had not.
The 748ft-long (228m) ship is known to have left Lagos in Nigeria on 5 October, and was heading to Fawley Oil Refinery near Southampton.
As it approached its destination just east of the Isle of White on Sunday morning it was reported that seven stowaways on board had become violent.
Lawyers for the vessel’s owners – Greek shipping company Navios – said the crew had been aware of the stowaways on board for some time.
Concerns over the crew’s welfare were raised at 10:04 GMT when the vessel was six miles off Bembridge, police said.
A three-mile exclusion zone was put in place around the vessel.
Tobias Ellwood, chairman of the Commons Defence Committee, said the boarding of the tanker was a “good outcome”.
He said: “Seven stowaways on board taking over a ship or causing the ship not to be in full command would have triggered a multi-agency alarm and then well-rehearsed classified protocols were then put into action.”
Hampshire police said after the suspects were detained that all 22 crew members of the tanker were safe.
“Police are investigating this incident and we have a number of inquiries to carry out to establish the full circumstances,” the force said in a statement late on Sunday.
According to maritime tracking websites, the Nave Andromeda reached port in Southampton early on Monday morning.
In December 2018, four stowaways were detained after they ran amok on a container ship in the Thames Estuary.
The men, from Nigeria and Liberia, waved metal poles and threw faeces and urine after being found hiding on the Grande Tema.