Any vessel is subjected to hydraulic forces and other physics. The same goes for a small survival raft made of wood.<quoted text>You obviously didn't read the link...
Hogging and sagging.
Hogging is the stress a ship's hull or keel experiences that causes the center or the keel to bend upward. Sagging is the stress a ship's hull or keel is placed under when a wave is the same length as the ship and the ship is in the trough of two waves. This causes the middle of the ship to bend down slightly, and depending of the level of bend, may cause the hull to snap or crack.
Sagging or dynamic hogging may have been what sank the Prestige off Spain on 19 November 2002.
Hogging, or "hog", also refers to the semi-permanent bend in the keel, especially in wooden-hulled ships, caused over time by the ship's center's being more buoyant than the bow or stern."
"Until the 1920's a large percentage of the world's shipping consisted of large wooden ships and their plague, after plain old rot, was "hog". A ship floating quietly in still water is subjected to external forces. These are the weight of the vessel on its cargo (downwards) and the buoyancy force (upwards). Archimedes showed us that for a floating vessel, these two forces must be equal in magnitude. For a floating rectangular piece of wood, they are also equal in distribution. For most normally shaped ships, the distribution is not equal. For example, when an empty ship has more weight (relatively heavy structure, engines and equipment) in the ends, and more buoyancy in the middle. This "excess" of buoyancy in the middle cause the middle to rise up and the ends to bend down -- a hog in profile. The opposite condition is sagging. For old wooden ships, this resulted in a long term, plastic deformation. The total curvature could be a meter or more in larger vessels. Some vessels like the Wapama hogged so much that they nearly broke in two.
Hogging is no longer the problem it was in the 1920's when it threatened the nation's merchant fleet -- because those ships have sunk!"
Is it possible a large vessel could be made of wood? Yes it is and other large wood vessels are recorded in history.
Is it possible this large wood vessel could survive at sea for just one year?
Yes it is possible. We have had debris from Japans Tsunami come all the way from Japan and land on US shores one year later. This debris was not made for a cross oceanic trip. But is survived the ocean trip.