So far I have found these possible locations for deep sea loot crates on Tunguska. Not sure if it's something you want to add in to the map or not, but it could be helpful for the official maps as well, just a toggle to show the possible locations. I don't think this is all of the possible locations on Tunguska yet, I've run a few laps where I've only seen one crate at these points so there is probably at least one more out there I have yet to locate.
23.10 / 25.25
30.76 / 66.46
38.12 / 24.66
51.6 / 74.33
52.00 / 23.74
67.54 / 26.08
70.30 / 39.98
70.68 / 61.19