We're talking a 120' yacht. Not a 400' commercial ship. Not a 50' Silverton. As an owner of a classed 130' recreational boat, but fiberglass instead of steel, we do have we have 13 automatic bilge pumps, float switches and alarms. Minimum of two in every bulkhead section. Then we have two emergency pumps (plus one backup) with lines to each compartment. And then we have an emergency engine driven pump. Now, I can't tell you what of that was required by class or what of that was just builder and design. I can also say that the stabilizers are installed in such a way as damage to one would not allow water into the boat. Also the moment an alarm went off we would look at the area on camera while others were going to the area. In answers to other questions brought up, we have multiple bulkheads some with waterproof doors and some solid. We have a total of three waterproof doors on the lower deck. Now, I can't tell you stabilizers or grounding had anything to do with this sinking. That may just be misspeak from the First Officer. I don't know what happened. I do know though that, in my opinion, there is a weakness in the system that allowed the boat to get in the situation it did without discovery of a problem. Your first knowledge of a problem should not be that the boat is listing very greatly. I can't speak to commercial steel ships. Perhaps their normal is much less. Perhaps the fact this boat was built by a commercial builder is reflected in it's design. Back to the most basic question, forgetting class, forgetting anything other than common sense and that is a 120' steel yacht should have a warning system adequate to notify the crew of water entering the boat before it reaches the stage at which this crew was apparently first aware, based on the words from their First Officer. The boat sank for two reasons. First, water was entering, for a reason we don't yet know with any certainty. Second, they were unable to detect, counteract, or stop the water entry. I would say that almost all sinkings have multiple causes, among three types. Design, accident or event, preventive or corrective measures.