The captain laughs at landlubber Axewielder's very off assessment of what the job entails .... because he takes him to the forecastle, which other than the crow's nest is the most elevated part of the keelboat ... and is where soundings are made.

Spoiler: Gharmez
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Roll a STR or Profession (sailor) check, followed by a CON check. If you don't have Profession (sailor), you can still roll a straight-up WIS check in its place.

Spoiler: Aasgar
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For soundings, roll either a Profession (sailor) check (or a WIS check) or a Perception check.