Silent Hunter

Red Alert! Red Alert!
TORPEDO LAUNCH DETECTED!

One of the Otsu Hyoteki Class Midget Submarines (probably!) initiates a torpedo attack on an enemy USN vessel.

Original Drawing by Syuto Koga:
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=7668188

Coloured by the Software: Recolored
https://recolored.en.softonic.com/?ex=CORE-117.5