Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: What does Jack use to wound the Kraken ? Title: Pirates of the Caribbean: Dead Man's Chest Movie plot: The wedding of Will Turner and Elizabeth Swann is interrupted by Lord Cutler Beckett of the East India Trading Company, who has arrest warrants for the couple as well as for Commodore James Norrington, for allowing Captain Jack Sparrow to escape execution. Norrington's whereabouts are uncertain, as he resigned after his obsessive pursuit of Sparrow resulted in the Navy's flagship, HMS Dauntless, being destroyed in a typhoon. Elizabeth is imprisoned, but Beckett promises to free her if Will tracks down Jack and brings Beckett Jack's magic compass which points to whatever the holder wants most. Shortly after, Governor Swann tries to escape Port Royal with Elizabeth but is captured. Elizabeth negotiates with Beckett to let her escape to find the compass herself, and she hides aboard a Scottish merchant vessel, the Edinburgh Trader. On the Black Pearl, Jack reunites with Will's father Bootstrap Bill, who reveals he is a crewman on the Flying Dutchman, captained by Davy Jones, whom Jack previously made a deal with to raise the Pearl from the depths. Jack must join Jones' crew or be dragged to Davy Jones' Locker by the monstrous Kraken. Will eventually finds Jack's crew on an island ruled by cannibals, who worship Jack as a god, from which they escape. The crew meet voodoo priestess Tia Dalma (Naomie Harris), who tells them Jones' weakness is his heart, locked within the Dead Man's Chest. Locating the Dutchman, Will is shanghaied into service while Jones sends Jack to bring him one-hundred souls so his blood debt can be paid. On the Dutchman, Will meets his father, and learns that the chest's key is in Jones' possession. After playing a game of liar's dice against Davy Jones, Bootstrap helps Will escape with the key, but Jones sends the Kraken after him, sinking the Edinburgh Trader. In Tortuga, Jack hires a new crew, including Elizabeth, and Norrington, now a drunk. All parties arrive on Isla Cruces where the chest is buried but a three-way sword fight breaks out between Jack, Will, and Norrington who all...
Jack uses a net full of explosives to wound the Kraken.