<p>A method and device for extracting sample cores from seabeds is disclosed. The method entails lowering a seabed coring device, comprising a core sampler and a cage, to a desired position above the seabed; releasing the core sampler from the cage means such that the core sampler embeds in the seabed; expanding an expandable member near an outer end of the core sampler to form a core retainer; drawing the core sampler into the cage; and bringing the seabed coring device including a contained core sample to the sea surface.</p>
