In the Lego Ninjago movie Garmadons engineers used to work for Sensei wu. What's supports my theory is the similarities in the designs of the ninjas mechs and the shark army's tech.
Earth Mech (The LEGO Ninjago Movie) | Ninjago Wiki | Fandom
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Fire Mech (The LEGO Ninjago Movie) | Ninjago Wiki | Fandom
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