It seems the bubble cars at this place were boarded by a pond they then floated over. Somewhere I found a picture of one of the cars in its abandoned and rusting state, but I can't find that again now, quickly. But here are a few more views of the ride
here:
Sub theater lifted from Aquarena Springs site
Sub theater lifted from Aquarena Springs site
http://www.mysanantonio.com/news/local_news/article/Sub-theater-lifted-from-Aquarena-Springs-site-3584128.php
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