Bitterne Leisure Centre swimming pool has suddently closed for repairs "for the safety of all users".
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The move follows a building survey that was carried out on March 2.
Southampton City Council says it closed the facility "with immediate effect".
According to the BBC, it's the pool's roof that has been declared unsafe.
Other facilities within the Bitterne Leisure Centre are unaffected and will remain open, but the council has said "all activity related to the swimming pools will cease until further notice".
Alternative swimming facilities are available at Quays Swimming and Diving Centre.
Updated 3/3/17 with information about roof being problem