The Swarmer Hives are cylinder-shaped tan platforms about the size of the Riptide with a golden rim on top and two rings for foundation. Their sides can as well slide down to reveal six golden barrels from where it can deploy an endless stream of Swarmers.
The Swarmer Hives only appear in the sailing sections of River Rush and Crater Lake where the Riptide is required. Only while steering the Riptide can the player destroy the Swarmer Hives. This can be done with the Riptide's weapons or detonating nearby mines.
In gameplay, Swarmer Hives generate an endless stream of Swarmers to attack the player. When approaching a Swarmer Hive, it will pop to the surface and deploy Swarmers that will torpedo towards the Riptide. However, a Swarmer Hive can only deploy up to six Swarmers at the same time. Should a Swarmers be destroyed however, the Swarmer Hive will immediately deploy a replacement. Upon destroying a Swarmer Hive though, it will automatically destroy the Swarmers it has created. For protection, the Swarmer Hives can retreat underwater for a short while. While underwater, the Swarmer Hives are invulnerable, but they cannot deploy Swarmers. When a Swarmer Hive is destroyed, its fundament can be seen in the water. Most Swarmer Hives are immobile, except for one in the beginning of River Rush which floats along the river, though only briefly.
In general, the player must destroy all Swarmer Hives present in an area to proceed with the respective level/objective. IN River Rush, they are the main obstacles, and in Crater Lake, they are connected to Salty's side quest where the player has to take out all the Swarmer Hives in Crater Lake that prevent Pepper from returning to Bygone Island safely.