Boats leaked! The well, where the pumps are located, is the lowest point on the ship. The idea was to get the water to the well so it could be pumped out. The frames could prevent water from flowing, trapping it between adjacent frames and leading to rot. The notches allow free passage of water despite the frames.Otherwise too boring to be sailor Lol
Hi Kurt,Mike as silly question on ship design, why let water in just to have to pump out again?
Those notches are called limber gates.