CAT submarine hydraulic excavator under the SEA part 1

This is awesome!! ... used to work underwater for a while with jackhammer and dredge, (etc) - Love this!!  However, I would be sure to keep a close eye on the seals and lines ... a leak would show on the surface pretty quickly.
 Pretty impressive work   . Only other underwater work I've seen was coal stockpiles in Japan with diesel dozers . Crazy stuffing