What would happen if you submerged a stargate in the ocean and either dialed out or someone dialed in?

This hsppens in an Atlantis episode, "The Shrine," and the gate seems to work. Atlantis has the shield up, luckily, so the water from the dial-in doesn't come through from the flooded gate. The gate does not shut down normally, however, due to water continually attempting to pass through and requires the 38-minute buffer to close the connection. Once it closes, Atlantis dials back out to the flooded gate and sends a jumper through.