What extreme condition dictated the specialized technology required for the Venera landers?

Answer

Temperatures soaring near $475^ ext{C}$ ($887^ ext{F}$) and immense pressure

The landers had to survive surface temperatures near $475^ ext{C}$ and pressures over 90 times that of Earth's sea level, conditions that would melt terrestrial electronics.

What extreme condition dictated the specialized technology required for the Venera landers?

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