the city doesnt matter...
Response from HolidayPlanner on Twitter
Touristy but v enjoyable nonetheless.
Bom Dia Sailing Cruises in Lagos. Try the 2hr Grotto trip. http://www.bomdia.info about 10 years ago
Sorry that answer from Twitter was for another question. :S
So I did a bit of research myself because no-one has answered this question yet.
Not the best of websites.
But it looks like these guys offer diving excursions for about €30
extra €30 for 2-tank dive off the shore
extra €35 for 2-tank dive from a boat
if you have your own gear it is only €15 for the boat dive
extra €20 for a trip to Sagres to see wrecks and caves
http://dive-time.net/index.php?/Book-Online/Dive-Time/Excursions/Diving-Excursions.html about 10 years ago