Have you got any indication to the contrary?? If so, shear your knowledge with DNV-GL and ABS, they have classed most, if not all the Drillships and MODUs built in the last few years.
On second thought; let USCG know, they would probably love to be proven wrong when they have approved these units for work in US waters. (OK, that last is "trolling")
As MWS I have approved several of them for passage from Singapore to GoM, or Brazil, via Cape in the winter season. If you are right, that these ships and rigs are badly constructed and maybe unseaworthy, I'm guilty of negligence.
Anybody that serve, or have served, on Drillships or rigs built in Korea or Singapore that would like to add their opinion here??