I'll have a glance at your ZIPfile (I hope this will tell me when you get confused). Meanwhile I'm going to try to explain the method again, with more details:

I quickly drew the hull... by creating a sphere and changing its length scale. Then I added a few ornaments.

__Note, the sphere (submarine hull) was drawn with its center at coordinates (0,0,0). __This location is very important for the last operation (SCALE).

Then I chose a few of polygons on the hull and drew (in flat on the hull) the "horns" base and edges (diamond like). See picture 1 of my second message.

You can just draw a polygons' diagonals, too.

A possible problem is you may have tried to draw directly the second diagonal just after the first one... but DS can't draw crossed lines across a polygon (thinks in terms of polygones: which would be these polyons defined by two crossed lines without intersection point?). So you have to draw the second diagonal in two steps: from a corner to the intersection point, then to the intersection point to the other corner).

Then I set the base and diagonals segments as sharp edges. If you skip the step, the final result will look more vegetal than mechanical.

Then I selected the diagonals intersection points (the future peaks) and asked DS to change these points coordinates' SCALE, ratio: 1.15 (the higher the ratio, the longer the "horns"). Thus these point coordinates are multiplied by this ratio and the points are moved away from the origin point (0,0,0) , so from the hull's bow.

I applied the 1.15 ratio to each direction. You can direct the "horns" more to a direction by using a higher ratio on the convenient direction.

Of course, you can type the new coordinates by hand, but this would take more time and would be a less glamorous method.

If you still don't understand the method, select a polygon on your hull and play with the SCALE command. I'll quickly understand its utility.