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kacper as one who hauled cont. i can assure you they are not airlock tight unless they are refrirated containers. all regular dry-dock (shipping term) cont. have vents in the top sidewall. this allows for pressure equalization and humidity control. having off loaded cont. from the orient/far eastyou can tell when shipped in the monsoon season/humid season. if your freind made that kind of money finding/retreiving lost cont. he was either very gifted at finding them or was working with someone insidethe steamship cos. that lost them. very few stay on the surface after a few days because they get (the contents) gets waterlogged, and the weight of the cont. will cause it to sink. used to get in cast cont. (CANADA STEAM TRANSPORT) they would loose on some trips do to weather 30-40 at a time and salvage approx. 5-15 depending on weather cond. at time of loss. most sank pretty fast, but there is always the exception.
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