We're working on a longer video of the expedition at the moment which will include details of the sampling and what we found, but here is a short overview of the journey including some of the audio diaries we recorded while in Canada.

So, we arrived in Inuvik a couple of days ago after three weeks on the river. We're now on our way back to the UK. It's been an amazing trip. We've got loads to update but here are a couple of photos as a taster...