Flooding is a consequence of a water layer, for a transitory or extended period, over the soil’s surface. The water layer might be thin or deep, causing plants to partially or persistently submerge. After the soil/rhizosphere is inundated, root systems and microorganisms deprive the residual oxygen, causing the environment to first become hypoxic (where oxygen levels restrict mitochondrial respiration) and then anoxic (where respiration is plenary inhibited). The initial shortage of oxygen required to maintain aerobic respiration in submerged tissues is thus the primary barrier to plant development during floods. Flooding has a significant negative impact on over 16% of all agricultural developmental regions worldwide. Nearly all crops suffer from hypoxia as a result of unfavourable climatic factors including excessive rain and saturated soil. Heavy, prolonged rainfall events and inadequate soil drainage are the main causes of waterlogging. Haplessly, current climate changes are predicted to cause an increase in the region exposed to waterlogging. Nevertheless, most have evolved several coping mechanisms to deal with it. Most likely, ribosomes bind to transcripts to get them ready for quick translation after reoxygenation. Another theory holds that certain proteins, such as heat shock proteins (HSPs) and ascorbate peroxidase (APX), are constantly destroyed in normoxic environments but stabilized in hypoxic ones. Aerenchyma formation causes changes in plant shape and may show changed gene expression patterns related to stress replication. In general, plant submergence tolerance is a complex physiological process that involves many adaptation systems working together to ensure survival and growth in anaerobic settings. Together with gibberellins and abscisic acid, ethylene functions as a hormone signal, causing the plants to grow larger. Ethylene holistically causes plants to magnify while submerged and promotes branch elongation in both semi-aquatic and aquatic plants. Although plants continuously produce ethylene in their modicum, submersion causes water to physically get trapped, which allows ethylene to increase rice plant shoot elongation. This mechanism increases the likelihood that plants will survive floods or submersion. Aerenchyma is also induced as a result of it. To allow the diffusive oxygen transport to reach the root tips, aerenchymal roots must grow. Under flood stress, GA upsurges in submerged plants as a flood survival tactic. For plants to deal with submergence stress, there are two separate adaptive replications or survival strategies: the low O2 escape strategy (LOES) and the low O2 quiescence strategy (LOQS). We epitomize that the molecular process involves developmental alterations such as the creation of root aerenchyma, elongation of the internode and petiole, adventitious root growth, and changes in shape and depth. However, in both tolerant and intolerant species, the initial cellular response to reduced oxygen availability is an increase in the anaerobic metabolism of pyruvate.