British media said the boat was stormed by the Special Boat Service with 16 personnel boarding the Liberian-registered tanker.
A Royal Navy frigate, believed to be HMS Richmond, was on standby but was not needed.
Eleven hours later, it was all over as members of the SBS, based at Poole, Dorset, boarded the 42,000-tonne Andromeda. Special Boat Service commandos were lowered by rope from helicopters onto the tanker, whose crew had locked themselves in a secure part of the ship known as the citadel.
Di Ministry of Defence call di incident "suspected hijacking" and tok say Defence Secretary Ben Wallace and Home Secretary Priti Patel authorise di operation in response to one police request.
Defense Secretary Ben Wallace said Sunday evening: "In dark skies, and worsening weather, we should all be grateful for our courageous personnel". People are safe tonight thanks to their efforts'.
"We should all be grateful for our courageous personnel", he added.
Those arrested were reportedly Nigerian stowaways.
Two Coastguard helicopters were sighted circling around the vessel, according to Isle of Wight Radio, which also reported that a three-mile exclusion zone has been placed around the area south of Sandown on the island's east coast.
Richard Meade, editor-in-chief of the mail-order news journal Lloyd's List, previously wrote on his website that he had received information that seven stowaways were on board.
In December 2018, four stowaways were detained after they ran amok on a container ship in the Thames Estuary. "It was desperation, you could hear the fear in his voice".
The U.K. military seized control of the oil tanker that dropped anchor in the English Channel after reporting it had seven stowaways on board who had become violent.
Several hours later, the United Kingdom special forces took control of the ship and detained the men. British police are investigating an undisclosed incident aboard an oil tanker in the English Channel.
"Armed forces have gained control of the ship and seven individuals have been detained", the ministry said, adding that the crew were "safe and well". Some reports suggested the stowaways tried to hijack the ship - something the lawyers for the vessel's owners have denied.
Bob Seely, who represents the Isle of Wight in Parliament, said the British Government was likely to convene a meeting of its emergency committee to discuss the incident.
"Navios would also like to pay tribute to the Master of the Nave Andromeda for his exemplary response and calmness and to all the crew for their fortitude in a hard situation", the ship operator said.