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I-400 Class Submarine

"The I-400-class submarine (伊四百型潜水艦, I-yon-hyaku-gata sensuikan) Imperial Japanese Navy (IJN) submarines were the largest submarines of World War II and remained the largest ever built until the construction of nuclear ballistic missile submarines in the 1960s. The IJN called this type of submarine Sentoku type submarine (潜特型潜水艦, Sen-Toku-gata sensuikan, Submarine Special). The type name was shortened to Toku-gata Sensuikan (特型潜水艦, Special Type Submarine). They were submarine aircraft carriers able to carry three Aichi M6A Seiran aircraft underwater to their destinations. They were designed to surface, launch their planes, then quickly dive again before they were discovered. They also carried torpedoes for close-range combat." -Wikipedia

replica of the I-400 IJN subs.
8 torpedo racks, 1 deck gun, and 4 AA guns.
when enemies are detected, will launch the 3 Seirans and then dive.
runs off of battery power when submerged, and will auto surface when out of power to recharge.
Seirans are based off of my Fi 167s

controls:
T/G for raising lowering periscope to min/max height. max depth for periscope is -26m. arrow keys control the periscope azimuth and elevation.
Y/H will spin the crane.
U/J commands the sub to either surface or dive to standard operational depth (-26m).
O/L will command the sub to ascend/dive. requested depth can be referenced by looking at the PID in front of the periscope screen.
it takes a little bit for the sub to dive to operational depth but is smooth when down there.