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dredging
Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location. This technique is often used to keep waterways navigable. Dredging is carried out to create a new harbour, berth or waterway, or to deepen existing facilities in order to allow larger ships access.
Wikipedia
dredging
Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location. This technique is often used to keep waterways navigable. Dredging is carried out to create a new harbour, berth or waterway, or to deepen existing facilities in order to allow larger ships access.
Wikipedia