killer whales with nuclear bombs that are attached with limpet devises to the bottom of the target ship to guarantee a "broken back" attack. They are trained to recognise the sounds of different propellers to accurately target carriers - which have four propellers. They are released from submarines. Makes perfect sense.
Some reports indicate that the 094 is not a boomer at all-the hump on its back enables it to carry for nuclear tipped homing orcas. :china: