Ağırlık=60 ton Boy=86 ft En=9.5 ft S.Ç=6.75 ft M.G= 1xdiesel (150 HP) ve 1xelektrik motoru (500 HP) Hız=16 knot Personel=5 kişi Silahlar=2x457 mm TT Dalabileceği Derinlik=100 m
28/1/1945=Kurahasi Jima.2 groups of 3 Type D Koryu midget submarines depart for Unten,under their own power,accompanied by small steamers Fuyo & Fuji Maru.The group includes midget submarines Ha-204,Ha-207,Ha-208.Enroute,they make stopovers at Hikari,Tokuyama,Hakata,Hirado & Sasebo.
10/3/1945=Ha-208 arrives at Unten.
26/3/1945=Between 17:56 & 24:00,Type C submarine Ha-60,Ha-64 & Type D Koryu submarine Ha-208 departs Unten to participate in Operation Ten-Go.Ha-208 is forced to reutrn to base soon thereafter because of a machinery breakdown.
27/3/1945=Ha-208 is sunk at Unten,during an American air attack.
31/3/1945=Unten.During a air attack Ha-60 is lost.