消磁是在部署前进行为了去除舰艇金属外壳上残留的磁场，以免在运行过程中被其它潜艇和水面舰艇发现。
Demagnetization is conducted before deployment to remove residual magnetic fields in the metal of a vessel to make it harder to detect by other submarines and surface ships.
三套舷侧声纳阵列在潜艇外壳上清楚地看得见。
Three flank-mounted sonar arrays are clearly visible on the hull of the submarine.
简氏海军认为从403开始潜艇的外壳已经从帆罩之后被延长8米，但是这不能够确认。
Jane's Navy suggested that from 403 onwards the hull of the submarine has been extended by 8m aft the sail, but this cannot be confirmed.
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