Number 4 in the 100th anniversary refresh project. Tom's father has perfected a new type of submarine drive and builds a sub to test it out. Originally meant to compete in a Government prize competition, they soon decide to use the submarine to look for millions in sunken gold bullion instead. An unscrupulous company with their own submarine try to make trouble for the Swifts and their friends, and want to reach the treasure to claim it for their own. Even if Tom and his crew successfully battle the other sub, giant sharks, a firing squad and all the other hazards to be found over two miles deep, will they actually find the treasure?
- ISBN10 1798273322
- ISBN13 9781798273326
- Publish Date 1 March 2019 (first published 1 January 2004)
- Publish Status Active
- Imprint Independently Published
- Format Paperback (US Trade)
- Pages 296
- Language English