A method of underwater trenching including providing an apparatus having a floating platform having an opening therein, a frame placed on the floating platform, a guide pipe inserted through the tower, a steel coiled high-pressure flexible hose attached to a high-pressure water pump, and a power source. Positioning the apparatus such that the opening is positioned over an area of water in which the sand under the water needs to be trenched. Lowering the guide pipe until an end of the guide pipe reaches the sand under the water. Inserting the hose through the guide pipe. Activating the water pump to induce until the sand begins to come up from around the pipe underneath a surface of the water indicating a sinkhole has been formed. Removing the guide pipe to collapse the sink hole to create the trench.

A method of underwater trenching including providing an apparatus having a floating platform having an opening therein, a frame placed on the floating platform, a guide pipe inserted through the tower, a steel coiled high-pressure flexible hose attached to a high-pressure water pump, and a power source. Positioning the apparatus such that the opening is positioned over an area of water in which the sand under the water needs to be trenched. Lowering the guide pipe until an end of the guide pipe reaches the sand under the water. Inserting the hose through the guide pipe. Activating the water pump to induce until the sand begins to come up from around the pipe underneath a surface of the water indicating a sinkhole has been formed. Removing the guide pipe to collapse the sink hole to create the trench.

Amphibious undercarriage systems, drive systems and work vehicles are disclosed herein. In an embodiment, an amphibious undercarriage system includes a pontoon, a first shaft, a second shaft, a track chain and at least one motor. The pontoon has a first end and a second end and is configured to float atop a liquid body. The first shaft is disposed at the first end of the pontoon. The second shaft is disposed at the second end of the pontoon. The track chain is movably attached to the pontoon so as to travel around the pontoon and moveably engaged with the first shaft and the second shaft. The motor is configured to drive the first shaft to cause the track chain to travel around the pontoon and the second shaft to rotate due to engagement with the track chain.