The second person in a dive team assists the lead diver by illuminating tie-offs and checking for ____________ line placements.

The role of the second diver in a dive team is vital for ensuring the safety and efficiency of a dive, particularly in cavern environments where visibility and spatial orientation can be challenging. When discussing the checking of line placements, the emphasis is on security. A secure line is essential because it prevents entanglement and ensures safety; if the line is not secured properly, it may shift during the dive, making it difficult for divers to navigate or potentially leading to dangerous situations such as losing the primary guideline back to the entry point.

This responsibility of confirming that the tie-offs are secure helps maintain the integrity of the dive plan, allowing divers to focus on their tasks rather than worrying about the state of their installation. A secure line ensures that there is no slack or potential for the line to come undone, thereby providing a stable reference point throughout the dive.

In contrast, the focus on loose, heavy, or visible line placements does not address the primary concern of safety and reliability in navigation. While these factors may contribute to overall dive awareness, the priority when checking line placements is ensuring they are firmly anchored and secure.