The Mark 48 Advanced Capability was a American heavyweight submarine-launched torpedo.
This weapon was used by the USS Massachusetts, a United States Navy submarine, to fire two torpedoes into the Shenyang, a Chinese aircraft carrier. The strike was caused by a fake fire order sent by Cheng Zhi using the Defense override module, and caused the Shenyang to be destroyed. ("Day 9: 8:00pm-9:00pm")