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Questions & Answers about Das U-Boot taucht runter.
What is runter short for, and does it mean motion towards or away from the speaker?
It is the colloquial short form of both herunter (down towards the speaker) and hinunter (down away from the speaker). In everyday spoken German, people usually don't worry about the speaker's perspective and just use runter for any downward movement.
Is runter a separate word here or part of the verb?
It acts as a separable prefix here. The full verb is runtertauchen (to dive down). Because this is a main clause in the present tense, the prefix runter splits off from the stem (taucht) and goes to the very end of the sentence.
Does tauchen already mean to dive? Why add runter?
Yes, tauchen means to dive, so the downward motion is usually understood. Adding runter just emphasizes the direction of the movement, exactly like choosing to say "dives down" instead of just "dives" in English.
What does the "U" in U-Boot stand for?
It is short for Unterseeboot (under-sea boat). Knowing this compound word makes it easy to remember the gender: since it is das Boot (the boat), it has to be das U-Boot.