The image shows the beginning of a toxic discovery preceded by a local human intervention. In this case, the mining of sea sand by locals represents a direct impact on nature, which introduces us to discover toxicity even on the deep nature far away from its common sources as a result of our consumption.
This image and its caption demonstrate the long journey for the ethnographer to the field site, in this case quite literally. Your journey started at a conference some time before (it is not clear when the photo was taken - this could be useful information in the caption perhaps) when you first met Dr. Mar. But it also required there having to be a field trip to be invited on, being invited to attend the field trip, and the slightly more obvious physical journey including undertaking a multi-mode transport route to get there.