Keeping a submarine warm is the easy part; with all of the electronic equipment, electrical systems, and engineering/propulsion systems, it gets pretty toasty, even in Arctic waters. It's keeping everything cool so that systems don't overheat that's difficult.
stay inside stay warm
they stay inside and stay near warm places
Charlie have to walk slowly to school and stay inside during recess in order to stay warm.
Fleas do not die in the wintertime. They either live on animals to keep warm, stay inside buildings, or find other places to stay warm.
Inside - 2007 Cocaine Submarines is rated/received certificates of: Australia:M
Euglena are not warm blooded animals, however they need to stay warm to live. They also can live inside of a warm blooded animal.
Inside - 2007 Inside Cocaine Submarines 4-1 was released on: USA: 10 January 2010
Because it makes the persons feet feel warm, and the heat inside the persons feet stay warm.
they wear very warm clothing and stay inside their homes
Nuclear Submarines can stay almost indefently for them it is a question of Stores (food). Diesel Submarines are really not designed for under ice operations. AIP Subs can stay submerged for prolonged periods depending on the amount of Liquid Oxygen it has.
Stay inside and keep warm. Do not go outside unless you absolutely must.
They huddle together in a ball to hibernate. The lucky ones on the inside stay warm, but the ones on the outside eventually sacrifice their lives to the cold.