BBC Sherlock: In Over Our Heads (2/3) PG-13

Title: In Over Our Heads 2/3
Rating PG-13
Spoilers: For TRF (3rd part, only)
Disclaimer: Don’t own them :(
Word Count: 2105 this part (6140 total)
Summary: John and Sherlock have been kidnapped. Will they be able to keep their heads above water? Literally?
Thanks: To my lovely beta reader, daasgrrl, for kicking this, and me, into shape. Any mistakes to be found are mine alone.

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( John took a deep breath...And held it as the water covered him completely.  )