Russia's second line of defense may feature an extensive network of underground tunnels, as Russian soldiers have been digging for more than a year, according to a spokesperson for the defense forces in the Tavriia direction.

"It's quite formidable. I don't understand why everyone perceives it as weaker. While the density of minefields may be lower, there are still quite a significant number of them. The only potential advantage on our side is that the trenches, ditches, and ceilings might not be as sturdy," he added.

It's worth noting that yesterday, OSINT researchers discovered a Russian tunnel under the occupied point of Robotyne, which became exposed due to a direct projectile hit. Those tunnels were enabling the enemy to move quickly and unnoticed.