Russian and Chinese business executives with government ties have held secret discussions on plans to build an underwater tunnel connecting Russia to Crimea in hopes of establishing a transportation route that would be protected from attacks by Ukraine.
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An underwater tunnel would just be open to underwater attacks.. submersible drones etc
You think you're going to embark on a major multi-year infrastructure project on contested land when the enemy has guided missiles?
How many air defense batteries are you willing to commit?
Wait, this is business executives discussing this, so they probably haven't thought about it.