StoneRoad2013's photos with the keyword: problem

What happens when you pump out a tanker without opening the air inlet ... Atmospheric pressure [about 14lbs per square inch in old money] will crush the tank quite easily. [American rail tanker] A similar effect ca be observed if you rinse out a plastic milk or pop bottle with very hot water, screw the top back on and then cool the bottle - it crushes in just like that. The severity of the collapse will depend on how thick the plastic is, how hot the rinse water is, and how well the top seals. I use this affect to crush plastic bottles prior to putting them in the recycling as they then take up less space. Not my image : Fair Use & educational purposes

Even decent quality plywood will fail when subject to water ingress, unless it is properly sealed at the edges before painting. (No93@DRC)