However, if a low porthole was left open, water could enter as the water bubbles.
From the newscientist.com
It opened up a porthole through which those minded to abandon ship might slither.
From the thisismoney.co.uk
You might quibble with the phony porthole vents, though they're a Buick tradition.
From the usatoday.com
Porthole, a video installation by Jamaican artist Oneika Russell, addresses women?
From the kentucky.com
The solid billet could also be used with a spider die, porthole die or bridge die.
From the en.wikipedia.org
Right now it biased and lacks that universalness a really good porthole has.
From the en.wikipedia.org
Next morning, I am awakened by the rising sun peaking through the porthole.
From the dailymercury.com.au
Then there's the tiny, porthole-like side windows for a genuinely claustrophobic feel.
From the smh.com.au
Another bled profusely after squeezing out a porthole of the overturned USS Oklahoma.
From the ocregister.com
More examples
A window in a ship or airplane
Port: an opening (in a wall or ship or armored vehicle) for firing through
A porthole is a small, generally circular, window used on the hull of ships to admit light and air. Porthole is actually an abbreviated term for "port hole window". ...
(Portholes) Port holes were originally gunports. In early days, no provision whatever was made for admitting air or light into the crew's quarters, which remained foul and gloomy until recent times.
(Portholes) Military-issue eyeglasses or the wearer of glasses.
(Portholes) Small square windows cut into the hull through which pirates could shoot guns.
(Portholes) glasses (also referred to as BC glasses where the BC can stand for Bootcamp or Birth Control - Birth Control because they are so ugly there isn't a chance of...well, they're that ugly)
Circular "window" in the side of the ship's hull or superstructure. Most modern cruise cabins today feature picture windows, full-length glass windows, French balconies, or balconies.
A port. A window in the side of a boat, usually round or with rounded corners. Sometimes portholes can be opened, sometimes they are fixed shut. Also see hatches.