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Ramona said..
This is not good news! Tapio ...
Other wording says yacht flooded from stern with water up to deck level in 5 minutes. No mention of a collision or being pooped so cockpit drain conduits, a sea cock or stern gland would ordinarily be primary suspects unless perhaps wind vane steering, mounts pulled free leaving holes.
In his initial interview before the race he speaks of all through hulls going through a small area below the cockpit with a watertight bulkhead at either end and also mentions having more water tight bulkheads than required as well as having a miniscule cockpit well.
The rudder post does however come up through the hull which I think is unusual in this race and for full keel yachts . Cockpit drain plumbing, stern gland and the rudder post conduit may not be considered through hulls but in any event you would have thought that the multiple bulkheads in the stern of the boat would have prevented sufficient Ingress of water size to sink the boat if I either of these failed.
Are there keel bolts?
With the yacht at the bottom it is possible we will never know.