A great sim !!
I have it running with dosbox and d-fend and still is a great sim, also is a good point see what differences in gameplay with sh4, and in some things still superior.
Some 2d interface and screens are still very cool like, tdc, damage management, captain cabin with log book and calendar, and finaly radar interface. with clear images and easy to read.
Finally the gameplay, scorts doing well his work, reacting when the submarine is detected and dangerous in depth charging. ships zigzagging and scaping at full speed when the first fish hit a target...
And the sound, very cool, if the sounds could be extracted and use with sh4 ... but not for a release mod , only for personal use.....(copyrights and law issues)
Sh4 have nice graphics but the gameplay was developed with sh1