I’m no expert, so I can’t tell for sure, but my guess is that they’re storing two different chemicals. The left one looks like it’s a non-flammable, extremely hazardous material that shouldn’t be exposed to water (maybe an alkali metal, like lithium or sodium). The right one is a hazardous material that is a fire hazard above 93°C (200°F), but otherwise stable (maybe some kind of diesel?)
So… If I had to take a wild guess, diesel and lithium batteries?
Or whenever I please, as in feisty and seize!