An entire fleet of tug-boats seem unable to move the ship. I don't think tanks would fare much better.
The proper solution is probably (?? I'm not an engineer, just spitballing here) a system of pulleys. See Archemedies and The Syracusia: Archemedies allegedly moved a ship powered only with his own muscles using only a system of pulleys as an assist.
I realize that the Syracusia is probably smaller than this container ship in the canal. Still though: a system of pulleys is probably cheaper and stronger than what a team of Tanks would do.
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They're at least in a situation where there's a ton of land nearby that can serve as an anchor point. I mean... the problem right now is probably just figuring out where and how to safely pull the ship. They need to apply hundreds-of-thousands of tons of force in a way that:
1. Won't break the ship apart
2. Successfully dislodges it
Its a relatively simple problem to apply hundreds-of-thousands of tons of force. But doing it in such a way to keep the ship floating... that's the hard part.