Return To The Sub From The Tower
OK, you've gotten to the top of the tower.  Now, you want to go back to the sub to re-check some information at the schoolhouse.  You go back to the trapeze but, lo and behold, you can't get back down!!  What now?  You will have to walk, I guess.  (What? You can't walk on water?  Guess you'll just have to find another way).
For More Information, Read On
For More Information, Read On
Where does the upper walkway go to?  You couldn't get to it from the lower walkway, so how can you get down?
This is one place you shouldn't need any more clues, so I'll leave you on your own as far as getting to the lower walkway :)
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Caution!!  Spoiler!!
The submarine has returned to its original point at the top of the cliff.  You have to lower it again and start over.
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