Definitive answer coming from Dot himself:
Quote:
Ship - torpedo will lock only at surfaced targets including surfaced submarines.
Sub - torpedo will lock only at submerged targets including sinking ships.
If no sub or ship is present on the icon then torpedo will lock at any type of target
Verticall arrow up - SHALLOW mode - torpedo wil go to the depth of 29.75 feet ( 9.07 m) after launch
Horizontal arrow - LEVEL mode - torpedo will stay at the depth it was launched (with some correction (I hope  ) for surface-launched torpedoes
Verticall arrow down - DEEP mode - torpedo wil go to the depth of 295.26 feet (90 m) or if there is a layer present to 29.75 feet ( 9.07 m) below the layer
2 verticall arrows down and a sub - VERYDEEP_SUB mode - torpedo wil go to the depth of 655,89 feet (200 m) and will lock only at submerged targets.
VERYDEEP_SUB proved itself not that useful so IIRC it is used only for 1 torpedo type for testing.
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