Abstract: Disclosed and claimed are methods and apparatuses for obtaining a sample with a sampler that includes a tip and tube that are positionable so as to be in or without fluid communication, and methods and apparatuses for obtaining a sub-sample therefrom while maintaining in situ pressure.

Abstract: Underwater sampling apparatus for collecting uncontaminated samples from an underwater environment at in situ pressure includes a sample chamber in which the sample is to be collected, and a lid chamber in hydraulic or pneumatic communication with the sample chamber for defining a controllable interface between the sample chamber and the underwater environment. The lid chamber includes a stack of lid-chamber-defining plates coupled together to form a unitary whole and a lid movable between a closed position sealing the sample chamber and an open position in which the sample chamber is open to the undersea environment. Motion control element move the lid between the open and closed positions.