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I had to look up the word in a dictionary: sustenance -
"something that gives support, endurance, or strength"
Accidentally I met Elvis the splashdiver - a few meters above a local open air bath close to my hometown. He was up there to set a new world record in jumping a cannonball. In fact Elvis is the official splashdiving world champion and on this day he exceeded his own record and jumped down from a height of 27 Meters above the waterline - crazy guy.
Obviously diving is something very important to him, something giving strength and support. There must be a good reason to jump from a 27 Meter crane!
For more about splashdiving check out this
website.