This zip has several different files trying to illustrate the difference (or presently, as of build 998.9, lack thereof) between diesel submarines running on battery power versus diesel power.

The original (Snort Test.scen), from forum user Talisman, has two Kilo submarines coming at a north-facing Type 209/Heroine class South African submarine from the west at 5 knots, just outside the first convergence zone.  One sub is at -70 feet and under battery power, and the other is at -66 feet and under diesel power.

The second (Snort Test v1.1.scen) moves the non-snorting sub at roughly an equal distance to the east to eliminate masking issues, still traveling at 5 knots.  The third (Snort Test v2.scen) has both submarines coming in at 10 knots (max speed for a snorting Kilo; snorting sub from the west, non-snorting sub from the east), as well as a supertanker "sprinting" in from the north at 18 knots to show that convergence-zone detections are possible with a loud-enough target.

In my test of version 1.1, I actually detected the non-snorting sub first, though that may be because it started out about a half-mile closer to the Type 209 due to imprecise placement.  In version 2, with the same error in starting location, the snorting sub was detected about 9 minutes sooner.