Given the Russians track record of greatly over exaggerating abilities which we only found out about after the iron curtain fell I doubt their claims. At the same time we all know the Silent Service is very tight lipped about the true abilities of its machines. This has always been her motto and it served her well for many years (and probably a huge reason the fleet was so successful during WW2). 250m is only a bit over 700 feet. We know that the Thresher back in 1963 was way below 400 m when she imploded.
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