6 ms·

Find an organism that passes through the passage and a way to track that. Hitch your wagon to something living that will be able to find a way.

• facepalm 11y ago
  A fish with a GPS tracker perhaps? If they attach them to ground animals, why not water?
  • psykovsky 11y ago
    They also/already attach them to whales, sharks and dolphins, at the least. I bet someone, somewhere, have done it to a fish...
    • kaybe 11y ago
      The limit is probably the size of the tracker. The ones I saw look about as big as a standard river fish..
    • a3n 11y ago
      Try otters. They'll eat the zebra mussels when they're done.