Ye, but if you are picked up by an escort with IRAI on... game over. I dived many times bellow 220m with all engines stoped, silent running.. even using decoys than playing dead and still the escorts are deadly precise in droping DC's. They never heard about thermal layer, decoys and all kinda tricks that some dudes can do under 220m depth.
So yeah, best tactics is what Venatore said, or adjust IRAI. I use option 2.
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