Find the native name in the skill tree
The official store calls the resource-cutting weapon a laser blaster; the recorded interface labels its unlock Plasma Gun. Use the label shown in your game to find the node. In this run, it is connected to the starting submarine node.
Check the purchase result
Before the demonstrated purchase, the wallet holds 40 shells and the node costs 20. After the upgrade, 20 remain and the node reads completed. The result is an unlock, not a level of bubble damage.
Use the resource beam during the next dive
The following expedition adds the resource tool beside the bubble tool. Its beam is fired at the floating scrap pieces. The recording shows separate counters for the two tools; a value shown beside one should not be copied to the other.
Keep later damage and range purchases distinct
The tree later exposes Plasma Damage and Plasma Range nodes. The unlock only grants the tool; it does not prove those later enhancements have been purchased. Inspect the selected tooltip when deciding what to upgrade next.