Today, the theory behind the concept has been tested and found to be watertight.
From the sciencedaily.com
Salt Lake pitching hasn't exactly been watertight, allowing 19 runs and 30 hits.
From the sltrib.com
Leaflets and posters against Kim's rule have appeared in the watertight society.
From the upi.com
We keep them right next to the hot tub in a plastic tub with a watertight cover.
From the dailyherald.com
They then fixed it to a weather and navigation buoy inside a watertight capsule.
From the newscientist.com
It's no good making the Treasury watertight when revenues are only trickling in.
From the guardian.co.uk
Whyte is a tech-savvy judge with a reputation for weighty, watertight decisions.
From the time.com
Many inventors find it hard to describe their ideas in a legally watertight way.
From the newscientist.com
However, the team were still failing to crack the watertight Leicester defence.
From the telegraph.co.uk
More examples
Not allowing water to pass in or out
Unassailable: without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
Waterproof or water-resistant describes objects relatively unaffected by water or resisting the ingress of water under specified conditions. Such items may be used in wet environments or under water to specified depths. ...
So tightly made that water cannot enter or escape
(watertightness) The condition of being watertight
A condition existing in water treatment equipment and materials of such precision of construction and fit as to be impermeable to water unless sufficient pressure occurs to cause rupture.
Impermeable to water except when under hydrostatic pressure sufficient to produce structural discontinuity by rupture.
Condition ascribed to a device that is constructed so that no water can move into or out of it except by design through inlets & outlets.
Watertight means provided with an enclosing case which will exclude water applied in the form of a hose stream for a specific time.