[knak]

why hasn't anyone checked them?

[Dog Gone]

There isn't any point in revealing a smoking gun until we're fully in position to do something about it. In fact, it could be rather detrimental.

[hoosiermama]

FUll spead into a coast would be as damaging as airplanes into buildings

[FairOpinion]

They could release their deadly cargo, if threatened.

And as the article said, if we sank them, they may contaminate the oceans, killing all life, and spreading disease, which may spread to humans.

There is a good reason for the name WMD.