The paper analyzes lateral and helical buckling of a rod submerged in fluid in tubing. The purpose of the paper is to revisit the controversy regarding the formula for the helical buckling load that still exists in the literature. The relation between the critical helical buckling force and the helix-pitch has been reexamined. Our analytical calculations and experimental tests confirm the results obtained by Cheatham and P.D. Pattillo((1)). The effect of the pressure acting on the rod was included in the analysis to explain the so-called "fictitious forces" introduced by Lubinski((2)).