Neutrino sinks monitor the neutrinos passing through a ship. The simplest neutrino sink is a core of deuterium shielded from other types of radiation. This core is monitored for light output induced when a neutrino hits a nuclei: the more deuterium molecules in the core the more sensitive the device, and thus the need to pack as many molecules in the core as possible. Advanced sinks determine the particles' vectors by using multiple cores arrayed in 3-dimensons and separated by neutrino absorbent shielding. High-pressure deuterium cores are exceedingly explosive, and the absorbent shielding will heat up in dense neutrino fields.