Something grabbed me from behind and for a moment I could feel water rushing by as I was pulled back and down. I twisted around and saw the squid that had grabbed me rush away. I'd been pulled down about ten feet. I swam back up to thirty feet and neutralized my buoyancy. I didn't take the time to consider what might have happened if the squid hadn't let go, or if more than one squid had grabbed me, or if a really big one had...
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