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Synthetic Aperture Radar (SAR) can see right through vapour and smoke.

I have revised my vision to remove the ineffective cloud and it now includes a cruise ship fiberglass "kitcar" shell instead.

Your wake will get you. They are titanic signatures.

Fun fact: a significant part of the Lockheed Sea Shadow program was wake suppression.

I'm guessing following an enormous plume of smoke might not be a challenge.

or maybe they already use narco subs to avoid detection