Completely uninformed guess is that what they're doing is faster and cheaper, and the "get it unstuck enough" point will be reached sooner. > Concrete is dry i

Completely uninformed guess is that what they're doing is faster and cheaper, and the "get it unstuck enough" point will be reached sooner. > Concrete is dry in 24-48 hours. Sure, but building a dam around the entire ship? How much concrete are you going to need, and how long would it take to build? They're pumping sand and dredging right now, today.