From April to June in the lunar calendar, fishermen in Phu Trach commune, Vietnam, utilize traditional thung boats to reach submerged reefs hundreds of meters offshore. They dive to harvest *rong mơ* seaweed, a local variety, capitalizing on the seasonal winds. This activity provides a significant income source, with fishermen reportedly earning millions of Vietnamese Dong daily. The seaweed is harvested from the seabed, representing a traditional livelihood for the community. The period between April and June is particularly productive for this type of seaweed harvesting. This seasonal work offers a valuable economic opportunity for the local population.