A class of sub that has largely disappeared, (the N. Korean Sang-O probably being closest) I decided to try my hand at a modern day version, designed for small navies that would have a difficult time affording, or operating modern SSKs. I tried to shrink wrap the design as much as possible, and keep the tech as relatively low as I could, to reduce cost and maintenance, so I chose an older design, the German Type 206, as my basis, with its eight torpedo tubes. As envisioned, no reloads will be carried, but 8 x Mk 48s or Sub-Harpoons should be enough to ruin anyone's day. Some potential customers might be Georgia, the Baltics, African, Middle Eastern, or South American nations. Some countries that already operate SSKs, but would like to field greater numbers, might be potential customers as well.
You could likely fit some mine racks externally,too...