The pressure exerted by the water at the depths of the ocean is indeed very high. However, if you were to bring a gallon of water from the deep ocean to the surface in a sealed container, the container would not break due to the pressure differential alone.
The reason is that the pressure inside the container would remain the same as the pressure at the depth from which the water was taken, as long as the container is completely sealed. The container would effectively act as a barrier, maintaining the pressure inside.
However, it's worth noting that the container would experience changes in pressure during the ascent due to the decrease in external pressure as it approaches the surface. If the container is not designed to withstand such pressure differentials, it could potentially rupture or deform. The extent of the pressure change would depend on the depth from which the water was taken and the speed at which it is brought to the surface.
To safely bring water from the deep ocean to the surface, specialized containers or sampling equipment are typically used. These containers are designed to withstand the pressure differentials encountered during the ascent and ensure that the water remains intact.