Hydrolators were an integral part of what was a great story - The Living Seas. It began with a walk through displays showing humankind's attempts and successes at exploring the seas over the years. You then entered a pre-show area that discussed the myths and legends of sea exploration. This was followed by a film showing the development of the seas and gave us a glimpse of what lie in the deepest, darkest parts of the ocean. The movie ended by offering us the chance to explore the seas ourselves. The screen image of the Hydrolators - elevators travelling through water - to take you down to the observation levels of Sea Base Alpha) was the last thing you see, until dramatically the theater doors swung open and the hydrolators (with bubbling water surrounding them). You boarded the hydrolator for you "journey" down. Once at Sea Base Alpha, you boarded Sea Cabs which gave you a glimpse of what you could see in the giant aquarium. Then, you were free to roam around the pavillion and explore at your own pace. The story was completed with another "journey" back up the hydrolator to Future World.
The first couple of times, I was convinced that the hydrolators were actually moving (I was a teenager). But, now, it seems like the entire storyline, the whole essence that made this a Disney attraction, is now lost. Now, it's just an aquarium. The concept of Sea Base Alpha was great.