The tour starts at the Torre del Oro and sails for about 15 minutes down past the Expo 29 site with a simple commentary in several languages before turning around
The tour then retraces its steps, but with no commentary back to the Torre del Oro and then on for another 15 minutes to the start of the Expo 92 site with commentary
It then turns round again and comes back to the Torre del Oro, again with no commentary
Given how expensive the tour is you don't actually get very much!