Sprut-SDM1

Thanks to S300V4 for the pic!

- Mountains, seas, different climates - optimised
- Engine, trasnmission, networking capability from BMD-4M and BMP-3
- net-centric module integrated
- updated FCS, blah blah
- 125mm gun
- 500km range
- Swims, of course (up to 3 grade)