Rangers stood in square configurations as waterborne instructors first demonstrated the tying procedures then watched as the rangers gave the knot tying a shot. When the knot tying class was finished, rangers moved to preparing their rucksacks for water carriage. The rucks were wrapped in watertight packages using ponchos. Each ranger was required to swim between 100 and 200 meters with the ruck attached to them. They also had to build poncho rafts with their rucksacks.
Rangers swam in two-man teams with two rucksacks.
The front man was attached to the rucks with a snap link and pulled the rafts as he swam while the back person pushed the rucks. The waterborne class also saw the rangers learning to build rope bridges and then cross them. Using six or seven-man squads, rangers put their newly acquired skills to use as they first set up the rope bridges on land to practice the procedure. They next had to do the same across a 25-meter water obstacle. The squads used three lanes to set up their rope bridges.