Planet X91 The Underwater Cave by Mark Stewart
Approx. 22,590 words.
Published on November 27, 2013.
Florian Fawkes 15, Clay Silver 16 and Josh Quinn 12 have piloted the massive spaceship the Piper to the sea where they hoped to wait out their stay in safety. There’s one thing they have yet to discover. The ship they’re on has a few secrets.
After watching aliens leave the teenagers stumble on an idea to order the USS Lock to return. The only thing they shouldn’t do is go for a swim.