I've heard of them, never been though, but I know the building. I think they were out diving one time I was wandering around buying gear.Plongée tek Marseille. Not close, but closer than Antibes.
Nico is a cool guy, he often dives with people with very diverse backgrounds (including GUE, since you mentioned it)
Btw, what is your level?
Fundamentals rec pass, looking to upgrade when I get a good amount of time in doubles, maybe beginning of next year, and PADI AOW, deep and search and recovery.