Dunwich: for whom the bell tolls?

In the Middle Ages there used to be an important port on the Suffolk coast called Dunwich. Coastal erosion and silting caused it to be abandoned and great storms destroyed it. They say a lot of the story is urban myth but there is a great legend that you can hear the bells of the 12 churches out from under the sea. Bells would be a problem in water. It is much more viscous than air so the clapper would find it hard to move. Supposing you could make a bell strike, the sound would travel faster in water than in air. Particles are closer in a liquid than in a gas so they pass on oscillations more easily. Sound goes about 4 times faster in water, although the precise speed depends on temperature. On reaching the surface, the sound would slow down. There would be refraction with the wave bending towards the normal line. That would make it hard to be in a position to hear the sound - but perhaps the top of the cliff would be the best place.