The Plympton and the Hathor are two wrecks that lie on top of each other. It is just a coincidence that the two wrecks sank on the same spot 11 years apart.
The SS Plympton, owned by the Commercial Steamship Company and on her last voyage was sailing from Rosario, Argentina to Falmouth, Cornwall carrying maize. She was ordered to divert to Dublin and deliver her cargo of maize there. Unfortunately, dense fog meant she ran aground on Lethegus Rock, taking on water fast. Her 24 crew and 1 passenger abandoned her, before she capsized and sank, taking 1 sailor with her (trapped in his accommodations below).
The SS Hathor, was built in 1912 by the Tecklenborg wharf in Germany and her route was between Europe and South America. During World War I, she was interned in Chile and her maintenance due to lack of money was neglected. However, hostilities ended, she sailed loaded with soda and oil cake for Portland. Her engines failed just off the Azores. Two tugs were ordered to pull her to Portland, however, after lines broke twice, she became unmanageable just of the Scilly Isles. The tugs pulled the lines free and she slipped onto the rocks near St. Agnes and sank on top of the Plympton.