The whale is flexible. The submarine is not, and is therefore subject to crushing from the pressure.
can they dive deeper than a nother bird? yes they can
No. There are plenty of diving birds which would have choked, drowned and died out unless they were able to hold their breath while diving.
The blue whale can dive for 10-20 minutes and dive for 500 metres deep.
Alex went deeper into a trance at the sound of the bell. My last dive was 75 feet deeper than the first.
Recreational divers usually don't go any deeper than 60ft. The recreational dive limit is 130ft.
Blue whales can dive to approximately 350 feet, for up to one hour. A lot deeper than that, see a video of a camera attached to a blue whale, on the related question, it gets down to almost 1000 ft.
All military submarines dive into deep water. The deeper they can cruise,the harder they are to find. I call 'deep' any more than 120 feet down, but most modern military submarines can operate as deep as 900 feet, many even to 1500 and possibly more. There are now many civilian submarines (shallow divers) which show tourists the undersea reefs and fish life. These generally operate between 30 and 90 feet down and I doubt that any could safely dive deeper than 200 feet at most.
an emperor penguin, they can also dive deeper than chinstrap penguins
No - most military submarines are limited to crush depths above 2,000 feet.
A gouge is deeper than a nick.
Maybe you meant "Hyperventilation" (overthreathing): The action of breathing faster and/or deeper than normal.
Submarines have variable density. When a submarine is in port, its overall density is less than that of water so some of it is above the surface of the water. They're made out of steel, which is more dense than water, but they're hollow; most of the volume of a submarine is air. To make a submarine able to dive, they pump water into tanks. By adjusting the amount of water, they can make the density equal to water's density, which allows the boat to stay at a certain depth without expending energy to hold it up.