Abzu mining is pain

[Mouse]

A full sharkdrone burst is, IIRC, 12 bullets, each of which does 1 damage.  A regular diving suit reduces ranged damage by 1/3, so that burst will do 8 damage.  You need to take 13 bursts to enter crit.  The bursts have >1 second delay between each other, meaning that you'll get more attacks in than it gets bursts in.  If you can't kill it before it crits you then I'm honestly not sure what to say.