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If they can spend 5 millions just for mast removal, I am pretty sure they could build some rough reinforced concrete dome / something similar all around it (15m depth ain't something impossible to build on) that could absorb most of the blast.

Say 50 million budget. Of course red tape, bureaucracy and just laziness/incompetence of state bureaucrats would make such budget balloon and drag for a decade or two, but it should be doable.

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Water is a great blast-absorbent material.

If 15m of water can't contain the blast, adding concrete or similar is more likely to add solid projectiles to the explosion than diminish the force of the blast.

It's the opposite.

You probably wouldn't build a dome. Better to build a open top cylinder so that the explosion is directed up. Then gravity takes the heavy stuff right back down, while water comes out as rain. Though that would be very expensive and hide the explosion so you can't sell tickets.

Note that I'm not claiming the above is a good plan. Just that it is better than a dome.

Build a dome and put a spaceship on top. An improvised Project Orion.

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