Lucky always seemed to have a strong affiliation with water, not unlike most children. Swimming came naturally and easy, and his fish like tendencies arrived very early in the development process. He appeared to become almost lost whilst staring at the bubbles, and any activity involving water always made him giddy with excitement.
We have since learnt that the sound and fascination often found near water sources blocks out the hectic surroundings and induces a calming effect. Swimming akin to a great big blanket; snug and tight like a big bear hug.
Therefore, should your Autistic treasure disappear a good place to start looking and lessen the panic is near water.