Passage Three
When my interest shifted from space to the sea, I never expected it would cause such confusion among my friends. Yet, I can understand their feelings. As I have been writing and talking about space flight for the best part of twenty years, a sudden switch of interest to the depth of the sea does seem to be peculiar. To explain, Id like to share my reasons behind this unusual change of mind. The first excuse I give is an economic one. Underwater exploration is so much cheaper than space flight. The first round-trip ticket to the moon is going to cause at least ten billion dollars if you include research and development. By the end of this century, the cost will be down to a few millions. On the other hand, the diving suit and a set of basic tools needed for skin diving can be bought for twenty dollars. My second argument is more philosophical. The ocean, surprisingly enough, has many things in common with space. In their different ways, both sea and space are equally hostile. If we wish to survive in either for any length of time, we need to have mechanical aids. The diving suit helped the design of a space suit. The feelings and emotions of a man beneath the sea will be much like those of the man beyond the atmosphere.
17. How did the speakers friends respond to his change of interest?
18. What is one of the reasons for the speaker to switch his interest to underwater exploration?
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