The 400-gt Hamal (built 1979) was boarded in the North Sea 100 miles east of the port and then searched after being brought into the harbour.
The BBC reported nine crew aged between 26 and 63 from the Tanzanian flagged ship have been charged with drug trafficking offences.
John McGowan, from the National Crime Agency's border policing command, said: "This is a potentially significant seizure of illegal drugs, only made possible by the co-operation between ourselves, Border Force, the Royal Navy and our international partners.
"The
