Cleaning device with adjustable belts and a method for using a such

The present disclosure describes subsea assembly (100) for adhering to, driving across and cleaning a submerged net (130). The subsea assembly (100) comprising a first subsea unit (110) for being positioned on a first side of the net (130), the first subsea unit (110) comprising a first subsea unit housing, at least two parallelly oriented first subsea unit belt assemblies, and a first subsea unit moving means configured to move the at least two parallelly oriented first subsea unit belt assemblies relative to the first subsea unit housing, and a second subsea unit (120) for being positioned on a second side of the net (130) opposite to the first subsea unit (110), the second subsea unit (120) comprising a second subsea unit housing, and at least two parallelly oriented second subsea unit belt assemblies. Each belt assembly (150) comprises a track (160) provided with magnets for generating an attractive force between the at least two parallelly oriented first subsea unit belt assemblies and the at least two parallelly oriented second subsea unit belt assemblies such that the subsea assembly (100) adheres to the net (130) when the first subsea unit (110) is positioned on the first side of the net and the second subsea unit (110) is positioned on the second side of the net (130) opposite to the first subsea unit (110). At least one of the first subsea unit (110) and the second subsea unit (120) further comprises a cleaning means (140) for cleaning the net (130).