I am pretty familiar with this boat , I work in the whalewatching business and have a close friend who helmed this boat for several years. it has 6 separate watertight compartments all separately bilged. The"pumps" that did not work were fire pumps that act as water extraction pumps in a emergency. I slow mowed the video of the vessel sinking that was on Chek6 and there was a visible tear below the waterline as well as ,what looked like , several other punctures below the waterline. I don't think a deadhead could do this much damage.
I am very glad no one was hurt in this incident , but it brings up a broader issue of who is driving these boats and what are their qualifications and experience ? I can tell you that anyone who stands on a boat from 5 to 60 tons , regardless of the training provided , takes a course and a oral exam from TC can be in command of one of these boats. I have seem some very frightening things things happen on the water and it was really just a matter of time before something like this happened.