Says in the article that the smaller boat held control electronics and power generation for the detonations.
As sad as it was, it is a better fate (lot cheaper, too) than being towed to a scrapyard.
Current state of affairs in the US is that the environmental regulations make it just about impossible to scrap ships locally, so they are cleaned (which takes some doing), and towed to other nations (usually in S. America) for recycling.
Artificial reef projects such as this forego the cost of towing, and they add some benefit to the local sealife.
My $.02;
jky
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