As for survival, you'll want to bring the usual supply of food, water, and med kits. If you're heading to the lava castle, and you want to make sure you don't need to backtrack, you should bring 2 purple tablets. Those are necessary to progress.
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The answer… really really close. If the lava is pooling or advancing slowly, you can stand right next to it to get a shot. You can not stand there long…you may have to get your shot and quickly retreat…but you can get very close.
Zone 3 includes areas gradationally less hazardous than zone 2 because of greater distance from recently active vents or because the topography makes it less likely that flows will cover these areas.
Is lava zone 6 safe? Zones 3-9 are considered “low risk” due to being protected by topographical barriers, being down-slope from the dormant Mauna Kea, or by virtue of not having been overrun by lava in the last couple of centuries.
Lava cools very quickly at first and forms a thin crust that insulates the interior of the lava flow. As a result, basaltic lava flows can form crusts that are thick enough to walk on in 10-15 minutes but the flow itself can take several months to cool!