Data: "It is clear the Borg are either unwilling or unable to terminate their
subspace links."
Beverly: "*That* might be their Achille's heel, Captain...their
interdependency."
Riker: "What do you mean, Doctor?"
Beverly: "He is part of their collective consciousness now. Cutting him off
would be like asking us to disconnect an arm or a foot. We can't do it."
-- "The Best Of Both Worlds Part II", Stardate 44003.3