I found a suitable area and brought out the shipping container, positioning it where I could easily get back in and dry off - once I retrieved whatever technology the hunter had stashed underwater. The man had rambled in his notes about why he chose to do it this way.
Writing of [EMP attenuation], [Faraday Cage], and a lot of other scientific terms I had to look up - only to then end with a much less formal description of [the big boom]. The old hunter didn't seem to like 'new tech' much, but still thought some was worth protecting from a 'nuke'.
The gear was supposedly in a plastic bag, and the PVC cylinder's interior was coated with glued-on 'aluminum foil'. Paint layered on the outside was done with a [conductive metallic epoxy] before a matte gray that matched local stones.