Dear Anna,

Thank you for your revised submission and for taking care to address almost all of the issues they raised. It's my opinion that the manuscript is now much stronger and I'm happy to recommend acceptance subject to some very minor revisions, which I detail below:

Sub-heading section 3.1 needs improved punctuation (e.g. channels' with an apostrophe, or place a colon after "channels"?)

Conclusions: following the reviewer comments, the revised manuscript is now much more substantive in terms of the descriptions of the subglacial channels and goes well beyond the original methodological advance of testing portable LiDAR. The addition of Section 5 is particularly welcome. However, the concluding section (7) is still very much focussed on the methodological advances. I would recommend that you add some of the more substantive results (e.g. from Section 5) to the Conclusions, i.e. so that it also incorporates some of the detail found in the abstract (lines 11-20).

Kind regards,

Chris Stokes

Dear Anna,

Thank you for your prompt return of your final revised manuscript, which I'm delighted to now accept.

Kind regards,

Chris Stokes