Welcome to the second Bronies Archive (B.A.) prompt! Without any further delay, let's dive straight into it!

Pinkie Pie has a space submarine!

Rules:
Stick to the prompt.
No NSFW
Submissions may be posted as a comment as long as they're under 300 words. Otherwise, post a link and the description of the story.
You may not submit multiple stories.
Stories must have been written after the prompt's date of posting.
Have fun!

Contest ends within a week.