Description Thunderbird 4 A small submersible craft carried aboard Thunderbird 2 and used for underwater rescues. An atomic fusion reactor is used to propel Thunderbird 4 to a speed of 40 knots on the surface and 160 knots underwater. A powerful adjustable searchlight enables aquanaut Gordon Tracy (figure included) to effect deep underwater rescues using a wide variety of instruments including cutting lasers, demolition rockets and battering rams, all contained within the nose section of this the sma
