Evolution of the original UT-600 A (Dolphin II class)
UT-600 C
-modfied superstructure
-snorkel added
-storage boxes for additional reserve torpedoes
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UT-600 CB
-like C version but with advanced AA armament
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UT-600 D
-improved turret construction to increase underwater speed
-no deck gun
-enlarged hull, increased fuel storage capacity and thus increased range, more internal space for reserve torpedoes
-(increased diving depth?)
-improved rudders and stabilizers
-increased engine performance
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UT-600 E
-same as D version but with hydrodynamic AA-mounts and improved superstructures
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