Blue Water Divers ask you to be at their Nanny Cay location by 8.30, which works well for the cruise ships, they don't like to take people from ships that are leaving before 4pm, because of the risk of a very slow day on the boat and not getting them back in time. Sail Caribbean Divers are the only ones on Tortola that do afternoon dives. We Be Divin are the closest dive center to the cruise ship dock. UBS are no longer in operation.