RSRD overwrites TMO air traffic and lowers the settings some, so you don't have the mean TMO planes bombing you at depths. Only a few planes carry the deeper charges, but they can get you and be long gone before you get TC down.
Shore guns are another killer using TC, so be careful around ports and straits.
For certain, you were attacked, hit ground, ect, not some glitch. Why I always leave the radar up when I dived patrolling, so I can see the planes coming and TC will drop when they reach the zone.
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