I would like to know how a Hylas 70 would fair in a tropical storm in
Would it flood or those boats would have a way to be hermetically
Don't think a lot of people on this bulletin board have extensive storm experience with the Hylas 70 series of boats.
Try the Hylas Owner's board for minute details.
In general: Most ocean going boats are designed to keep water
out of the boat.
Therefore, if hatches, doors and other openings are kept closed and sealed, water intrusion would be minimal.
An electrical system
with numeorus pumps should also help to keep the water out and prevent sinking.
A nuclear attack or a high speed collision
with the USS Nimitz could cause cracks and possible sinking, even in a no-storm situation.
If this is eye-popping news to you, I would recommend not buying
a Hylas 70 right away.