To get Magnetic Ion Armor you must research (if I remember correctly)
Deep One Corpse
Aqua Plastics
Aqua Plastic Armor
Ion Beam Accelerator
LIVE DEEP ONE (probably what you've missed)
Ion Armor
Lobster Man Navigator **
Magnetic Navigation
Magnetic Ion Armor
** note some versions don't require the Lobsterman Navigator to research Magnetic Navigation
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