Why known destroyer wrecks still need investigation

Are HMS Mohawk and HMS Bedouin still lost, or have their wrecks been properly studied?

Mohawk's location is known but under-studied, while Bedouin has received almost no serious wreck investigation.

Mohawk lies in shallow water, yet its accessibility has not produced as much investigation as the wreck deserves. Bedouin has received even less attention. A wreck can therefore be geographically located while remaining poorly documented as a historical site.