The Causeway was finally completed on April 1908. But by the early phase of World War II, the Causeway posed a risk in which German forces would cross the bridge and invade England. British military intelligence planned on dynamiting the Causeway along with German infantry and armor columns when they would cross; however, Mina Murray and Allan Quatermain disobeyed that order and destroyed the Causeway sooner in 1941.
By 1969, the remains of the Causeaway has since fallen into disuse.
Mssrs CALKIN & SOWYERS OF DOVER. ENGINEERS TO Her Imperial Highness and builders of the CHANNEL CAUSEWAY regretfully announce a revised completion date of February 1902, owing to Mechanical difficulties. LONG LIVE THE QUEEN.