This is a fragment, friend.
Another APEX Answer is:
Sometimes my heart was sinking so fast with anger, desolation, and weariness, I was afraid it would sink to the very bottom of the Pacific...(209)
Explanation:
Here Pi is fighting himself internally. He has depressing thoughts such as just giving up. He has a choice whether or not to act on those feelings which is the battle itself.
Answer:
Perhaps a direct, neutral, or depressing tone.
