Three more men have been charged after 700kg of suspected cocaine was found in a van.
On July 8, officers stopped the van in Priory Road, leading to the discovery of the suspected Class A drug.
The cocaine was taken and moved to a national secure storage centre outside of the area.
A rigid hull inflatable boat was also seized by the South East Coast Organised Crime Unit (SEROCU) which is leading the investigation.
The unit previously charged Reiss Stanley, of Gaydon Road, Solihull, on July 9 in connection with the incident.
Now, a spokesperson has confirmed SEROCU charged three other men.
On Wednesday (July 17), Allen Fowler, 69, of Priory Road, was charged with participating in the activities of an organised crime group.
Thomas Walker, 32, of Abererch Road, Pwllheli, Wales, was also charged on the same day with conspiring to fraudulently evade a prohibition on the importation of a Class A drug.
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Fowler and Walker were remanded in custody and will appear at Southampton Crown Court on August 8.
On Friday, Stephen Lock, 41, of Fieldhouse Road, Birmingham, was charged with conspiracy to evade the prohibition on the importation of a controlled drug of Class A.
He was remanded in custody and will appear at Southampton Crown Court on August 8.
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