sentences:  The P. 1500 was to be 25 m (82 ft) long, weighing 1800 tonnes, with a 250 mm hull front armor, four Daimler-Benz MB.501 diesel aero engines, and an operating crew of over 100 men.This "land cruiser” would have been a self-propelled platform for the 800mm Dora/Schwerer Gustav K (E) gun artillery piece also made by Krupp – the heaviest artillery weapon ever constructed by shell weight and total gun weight, and the largest rifled cannon by calibre.The Schwerer Gustav fired a 7-tonne projectile up to and was designed for use against heavily fortified targets.