There are a number of companies that specialize in neutron radiography techniques, which is what's used in the aerospace industry to inspect things like metallic castings and welds. I'm not sure whether they've been applied to the shipbuilding industry previously. Certainly those techniques provide a very high level of inspection and imagery that will identify any particular defects. Clearly, in the aerospace industry, those types of defects can be fatal immediately, so there's a very high-quality standard that's imposed upon the aerospace industry.
A number of groups that have grown up in Canada specialize in neutron radiography, and they might be able to provide some insight into whether their techniques can be applied to shipbuilding techniques.