Systems, devices, and methods, adapted to immersively test/inspect machine components (e.g., tubes, conduits, etc.) in an in-situ manner are disclosed. In one embodiment, a system (100) includes: a first seal member (110) configured to sealingly engage a first portion (54) of a machine component (50); a base system (130) connected to the first seal member (110) and configured to extend within the machine component (50), the base system (130) including: a housing (140); and a inspection device (180) disposed within the housing (140) and configured to inspect the machine component (50); and a second seal member (120) connected to the base system (130) and configured to sealingly engage a second portion (56) of the machine component (50).