Naval Submarine School Public Affairs Officer email icon. If you choose to send e -mail, any contact information you provide will be used solely to respond to your. Noun. (plural subschools). A school making up part of a larger school. Origin. sub - + school. English Wiktionary. Available under CC-BY-SA license. Link/Cite. Basic Enlisted Submarine School (BESS) is the U.S. Navy's submarine training school for enlisted sailors. Located on Naval Submarine Base New London.