This study investigates the vibrational behavior of palm leaflets submerged under varying conditions in water, focusing on flexible cantilever beams made from a coke can material. The beams, with dimensions including a thickness of 0.102 mm, a density of 850 kg/m3, and a Young’s modulus of 5 GPa, were subjected to controlled sinusoidal motion using a shaker. Laser Doppler vibrometry was employed to analyze the vibration characteristics. The experiments were conducted within a 150-l fluid tank to minimize wall effects, ensuring accurate flow dynamics near the oscillating structure. Standard room temperature conditions prevailed, with assumed fluid properties of density and dynamic viscosity. The results demonstrate that increasing the submerged length of the beam in water significantly reduced both its first mode frequency and quality factor. These changes primarily stemmed from fluid loading effects and heightened damping within the submerged environment. The surrounding fluid added mass and viscous resistance to the beam, altering its natural frequency and decreasing its ability to sustain high-quality vibrations. This research underscores the pivotal role of fluid-structure interaction in influencing the vibrational dynamics of submerged cantilever beams, highlighting implications for various engineering applications where such interactions are critical.