1/350 Tamiya Ship #19 Japanese Navy Submarine IJN Submarine I-400Product Description 1 350 Ship Series No. 19 Japanese Navy Submarine I 400 Item No: 78019 Length: 348. 5mm. Image shows assembled and painted kit. The World's Largest "Submarine Carrier" The I 400 was a submarine the likes of which the world had never seen before. At the time of their completion, the I 400 and her sister ships were the largest, and arguably the most advanced submarines in the world. With a 122m length, 12m width, and 6,560 ton