Illex Plug Squirrel / Deep Dive Squirrel (Perch) The Illex Deep Dive Squirrel 67 (6.7 cm) is a bower-like plug that can even be made to swim backwards for a short time by using several “switches” in quick succession. (Diving depth 2.0 m) The Illex Squirrel 61 (6.1 cm) and the Illex Squirrel 76 (7.6 cm) also reveal their qualities especially when “Twitchen” and shoot back and forth panic-like. (Diving depth 1.0 m). Suspending. With hook.