HIJMS RO-100 (Kaisho / Type KS)
Development and production of the RO-100 series (sometimes referred to as "Kaisho" or "small" or simply Type "KS") of Japanese submarines was started in earnest beginning in 1940. The vessels (eighteen in total) were designed...

IJN I-15
The most numerous of all the World War II Imperial Japanese Navy (IJN) submarine class’s was the B1-Type, nicknamed the "I-15" class after the first boat launched. Twenty were produced and the I-15 was commissioned on Septem...

Kaiten
The Kaiten (meaning "Reverse Destiny" or "Change the World") was based on the Japanese Navy Type 93 torpedo and was a top secret suicide weapon, a one-person manned torpedo with a 3000lb (1,360 kg) warhead. Almost 400 of the...

Type VII
Type VII u-boats made up a large part of the u-boat fighting force in the Atlantic. This class of fighting ship helped the German Navy reign the high seas between America and England for years and became the face of the U-boa...

Type XXI
The Type XXI series of German U-boats were a phenomenal revolutionary design brought about in 1944. Their type was designed specifically for lengthy underwater operations centered around proven high-powered electrical machine...

Type XXIII
The Kriegsmarine Type XXIII were developed as smallish coastal submarines to operate in the shallow waters between England and France and the Mediterranean Sea. These boats were part of the all-new electric boat designs pione...

Type XXVII Seehund (Seal)
The Seehund (seal) was the most successful of several Nazi Kriegsmarine attempts to perfect a midget submarine designed in 1944 known as the XXVII B 5, also known as Type 127. Their small size and evasive action made them vir...

USS Grunion (SS-216)
The USS Grunion (SS 216) is best known for her mysterious dissappearance. Until recently, little was known of the last whereabouts of the vessel and her 70 crew members. It was known that she had been attacked after experienc...

USS Ling (SS-297)
The Ling (SS-297) is a late model Balao class and was the result of an improved Gato class submarine which 77 were produced. A major difference between the two boats was an improved pressure hull in the Balao class having 7/...