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Interesting reports on TripAdvisor. Either they're superb or terrible, depending on the reviewer, no middle ground. Our experience dates from 2004, so it's not very recent. Our dives weren't very long, but they weren't restricted to 30 min either. We dove 2 days. First day was 2 dives at El Arco, #1 was 61 ft max for 47 min, #2 was 92 ft for 36 min. (Reverse profile because I insisted on seeing the famous "sand falls" on the second dive and the DM accommodated us.) Second day was "across the bay", #1 was 54 ft max for 39 min, #2 was 44 ft for 42 min. We didn't care for these dives as much - viz was down and we had to kick a lot. We'll be there in December on a cruise ship and will either use Amigos again or we'll check out Manta, whose website specifically mentions they cater to cruise ship itineraries.