The ark was 300 cubits long, and 50 cubits wide; the height was 30 cubits. For a long time people did not know exactly how much a cubit was. One day in the later years of the 19th century, archaeologists found a tunnel in Jerusalem. This tunnel had been built in the days of King Hezekiah (around 700 B.C.). At the entrance was an inscription that said the tunnel was 1200 cubits long. The archaeologist measured the tunnel and saw it was 1800 feet long (54,000 centimeters). So now, people know that the Hebrew cubit, at least in the time of King Hezekiah, was 20.4 inches (51.816 centimeters).