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The hardness of limestone can vary greatly, from relatively soft to extremely hard, depending on factors such as its mineral content and degree of compaction. Soft limestones can be easily drilled using standard drilling equipment, but harder varieties often necessitate more robust machinery and specialized bits. Carbide-tipped drill bits, for instance, are commonly employed due to their durability and ability to withstand the abrasive nature of limestone.

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At its core, a tunneling tool creates a 'virtual pipe' through which data packets can travel, often masking their true origin or destination. This is particularly useful when dealing with firewalls or network restrictions that might block certain types of traffic. For instance, a common application is the use of SSH (Secure Shell) tunneling to securely access resources on a remote network by encapsulating non-secure protocols within a secure SSH connection.

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