The Krick U-Boat Style R/C Submarine. We’re talking 44 inches long here, so 1:60 scale, with a four channel radio controller, a ‘Drive and Dive’ set so you can sink and swim the thing, and a little hook and line to drag it up when it all goes pear shaped at -10,000 feet. Or something. Around $789.00 all in.
Molded ABS structure with some polystyrene parts is highly detailed and you can assemble it into an accurate scale display model. Or, you can add KK311 U-Boat Drive and Dive Set which installs into the lower section of the hull. Drive and Dive Set allows flooding of the sealed lower hull section to the point of neutral bouyancy. At this point the dive planes can be used to realistically dive and cruise the sub below the surface of the water.