No. Most cars aren't even approximately watertight.
There have been "amphibious" cars that are watertight on the bottom, to allow them to float, but even on these the door seals usually aren't completely watertight, and there's almost always ventilation of the passenger compartment somehow ... it may float, but submerge it and it would fill up with water.
Watertight means that when the lid is sealed, water cannot get into or out of the container.
6 watertight compartments
Watertight means that when the lid is sealed, water cannot get into or out of the container.
A sentence using the word Water tight could be "Is this seal watertight?" .
It did
The iceberg ruptured how many of the Titanics watertight compartments
The Titanic was thought to be unsinkable because of the nine watertight compartments
camel
sino ako
pee on it
1789
Yes.