# German submarine U-31

> S181

**Wikidata**: [Q453751](https://www.wikidata.org/wiki/Q453751)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/German_submarine_U-31_(S181))  
**Source**: https://4ort.xyz/entity/german-submarine-u-31


## References

1. Freebase Data Dumps. 2013