By detecting the antineutrino flux from a nuclear reactor, it is possible to identify its operational status, allowing for nuclear reactors to be monitored. The Water Cherenkov Monitor for Antineutrinos (WATCHMAN) will use a detector comprised of a large tank of water lined with photomultiplier tubes (PMTs). There is a possibility of the PMTs breaking under the water pressure, so we are testing them under pressure to determine what factors would cause them to crack.