It had an estimated street value of £76m, according to the Home Office.
Officials seized the cocaine after it was discovered in a shipment of bananas bound for Europe, the department said.
Border Force officers discovered the cocaine - weighing a total of 946kg - after identifying “anomalies” with the cargo in the container at Southampton port.
It was suspected to have been placed in the cargo in Colombia and was bound for Antwerp in Belgium.
The class A drug was discovered onboard a ship during a routine inspection.
“This significant seizure has removed a large amount of dangerous drugs from the streets, which not only reduces the significant harm they cause to communities but also makes a huge dent in the profits of smugglers,” Tim Kingsberry, regional director for Border Force South, said.
Priti Patel, the home secretary, said it was “drug smuggling on an industrial scale”.
“I'm delighted that Border Force officers have prevented such a large quantity of dangerous goods from reaching our streets,” she said.
Border Force officers have seized 946kg of cocaine, worth around £76m, hidden amongst a shipment of bananas bound for Europe.
We continue working hard to keep illegal substances off our streets. pic.twitter.com/OrrIeVdY65
— Home Office (@ukhomeoffice) January 22, 2021
The home secretary added: "We are sending a strong signal to criminals in the UK and abroad seeking to smuggle drugs into or through the UK - your efforts will fail and we will use every part of our law enforcement powers to stop drugs from coming into the UK."
The discovery in Southampton comes the month after over a tonne of cocaine was found hidden in a shipment of banana pulp at London Gateway port.
The class A drugs were concealed in the cargo in Colombia and were heading for the Netherlands.
Over in Canada this month, authorities said more than 20 bricks of cocaine hidden in banana shipments had ended up being delivered to grocery stores in a bungled drug-trafficking operation.
Additional reporting by Press Association