The cave is much less-known than the nearby Māra’s Chambers, but in terms of its size it is twice larger than the largest Māra’s Chamber. Just like all chambers, this cave in the yellow sandstone rock has also been formed by springs when the water from the underground gradually eroded the sand grains and formed hollows. The length of the cave is 11 meters, height of the ceilings in the cave more than 2 meters. The cave is quite safe, it can be a nature tourism object for small groups of people.
The Plunderers’ Cave is also called the Māra’s Spring Cave, and the spring flowing from it, probably, is an ancient holy spring. The Plunderers’ Cave was mentioned in the book “Album Baltikum” published in 1907. In this book there is one more Holy Spring mentioned located about one and a half verst from the Māra’s Chambers, in the forest of the Kalica manor house, by which in ancient times people used to make offerings. Actually there is a group of springs consisting of at least eight springs, located in the woods, in the winding of the Abava’s right side main bank. Maybe the status of being holy was attributed to some of these places in newer times, but it can be as well that, for example, when the Catholic Church prohibited people to hold ancient rituals at the Māra’s Chambers, they started to use the hardy accessible Māra’s Spring Cave as a pagan holy site (later also called the Plunderers’ Cave) and the Holy Spring in the woods by the Mazstepes. According to other tales, in reality the Māra’s Spring Cave is a Plunderers’ Cave, because plunderers who attacked merchant boats in the Abava used to hide their capture in the cave.