Minecraft wiki entry for Seed_(level_generation), associated text: Certain seeds return 0 in the internal code,[5] causing infinite arrays of caves and other structures to generate.[6] In Java and Legacy Console editions, the seed 107038380838084 returns 0 on the first call and 164311266871034 returns 0 on the second call, causing mineshafts, caves and underwater ravines to loop on the X and Z axes respectively.[7] Underwater caves and normal ravines do not repeat with this seed for 1.13 onward, as a salt was unaccountably added for these. However, if 1 is subtracted from either seed, ravines and underwater caves repeat, but the other three structures do not.