pressure-watertight
21German battleship Scharnhorst — Scharnhorst Career (Nazi Germany) …
22Hasholme Logboat — is a late Iron Age boat (750 390 BC) discovered at Hasholme, an area of civil parish of Holme on Spalding Moor in the East Riding of the English county of Yorkshire.The boat was located and excavated at Hasholme, on the north bank of the River… …
23Diving helmet — Copper and brass three bolt Soviet diving helmet …
24canals and inland waterways — ▪ waterway Introduction natural or artificial waterways used for navigation, crop irrigation, water supply, or drainage. Despite modern technological advances in air and ground transportation, inland waterways continue to fill a vital …
25Junk (ship) — This article is about the history of the sailing vessel in China. For modern developments and sailing techniques, see Junk rig. A junk from the 13th Century, Song Dynasty …
26Diving chamber — The decompression chamber at the Neutral Buoyancy Lab A diving chamber has two main functions: as a simpler form of submersible vessel to take divers underwater and to provide a temporary base and retrieval system in the depths; as a land or ship …
27Wood preservation — All measures that are taken to ensure a long life of wood fall under the definition wood preservation (timber treatment). Apart from structural wood preservation measures, there are a number of different (chemical) preservatives and processes… …
28Escape trunk — An escape trunk is a small compartment on a submarine which provides a means for crew to escape from a downed submarine; it operates on a principle similar to an airlock, in that it allows the transfer of persons or objects between two areas of… …
29Diving watch — Omega Seamaster model 2220.80, with a water resistance of 300 m (1,000 ft). The second crown (at 10 o clock) is a helium release valve. A diving watch is a watch designed for underwater diving that features, as a minimum, a water… …
30building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
