Wrench



The Wrench is the only melee weapon you obtain in BioShock.

You receive this item at the beginning of the game, during the tutorial level "Welcome to Rapture".

This weapon cannot be upgraded, though you can use various Tonics to change its characteristics.

Tonics you can obtain that effect the Wrench are:
 * SportBoost
 * Bloodlust
 * Wrench Jockey
 * Wrench Lurker
 * Frozen Field

You get a flat 50% bonus to damage dealt with the Wrench as a reward for the fourth level of research for the Bouncer variations of Big Daddies.

Trivia
Before you pick up the wrench, Atlas says, "Now, would you kindly pick up a crowbar or something...". This is likely an allusion to Half Life's protagonist, Gordon Freeman, and his most popular weapon, the crowbar.