Yes, but not through "cracked" websites. Unknown Worlds Entertainment, the developer, does not offer the base game as a permanent free-to-play title. However, there are three primary legal avenues to get the latest version for $0.00.
Players with pirated versions report losing 40+ hour saves because the crack bypasses Steam Cloud saves. When your hard drive fails, your Seabase is gone forever. subnautica free download latest version