Immersed Friction Stir Welding (IFSW) involves producing friction stir welds completely submerged in a liquid, usually water. In this work, immersed friction stir butt welds were run on AA6061-T6 for comparison with conventional FSWs made using the same tooling and optimal parameters. The welds were made at a rotation speeds of 1000 - 2000 rpm ad travel speeds ranging from 5 - 14 in min^-1. Prior studies of immersed FS processing has shown that much finer grains may be produced in the weld nugget with IFSW. Although previous work has been published in submerged friction stir processing, SFSP, no data was presented regarding improved yield strength. The reduction in grain size is expected to produce greater yield strengths relative to conventional FSW. In the work reported here, tensile tests were conducted on both sets of welds. Welds were subsequently cross sectioned and hardness testing was conducted as well. Temperature of the welds were recorded with the use of thermocouple implantation. Properties of these welds vs. traditional welds and welding methods are discussed with respect to on-site underwater repair and/or construction to determine the future viability of this joining technique in industry.