Janeway comments that the ship has travelled 15,000 light-years.

Voyager encounters a vast Mutara-class nebula, but when they enter, everyone except the Doctor and Seven is severely affected by its radiation, and one crewmember dies. As it would take a year to go around it, Janeway decides to put all the crew except the Doctor and Seven in suspended animation in stasis chambers with independent life support while Voyager takes the month-long trip through the nebula which extends for 110 light-years.

The stasis chambers are set up on Deck 14 so that it will be easy to monitor them (pictured below).

In the Season 1 story [#20 The 37's] Chakotay estimated that the ship could not function with a crew of less than 100. Presumably he meant for extended periods of time, say, longer than the month required to navigate the nebula.

This episode includes good footage of several places on Voyager without people e.g. Jefferies tube junction, bridge, cargo bay. More examples below. Larger screenshots are elsewhere in SHIP USS VOYAGER.

main engineering

corridor

All the crew save the Doctor and Seven are placed in stasis chambers in a state of suspended animation. Each chamber is equipped with independent life support and can be opened from the inside. According to Janeway, other crews have been in stasis much longer than a month. She explains: the crew will enter the units, their cardiopulmonary systems will be slowed, neural activity suspended, and later they will wake up feeling as though they had had a good night's sleep. Seven and the Doctor will check the crew's vital signs four times a day. It is not unheard of for people to come out of stasis and start wandering in a "sleepwalk"-like state, as happens several times with Paris.

Paris, not in his stasis chamber

The Doctor's program begins to degrade in the mobile emitter. He makes it back to sickbay, but with his mobile emitter malfunctioning he has to stay there for the rest of the trip through the nebula.

In addition to routine maintenance, the nebula affects all of Voyager's technology. The computer alerts the Doctor and Seven that the antimatter storage tanks are failing and plasma is leaking. Seven rushes to engineering to eject the tanks only to find that it was a false alarm. Malfunctioning gel packs are found to be responsible for the false sensor readings. The first of the packs to fail are located in Sequence 6-Theta-9. The nebular activity is causing the gel pack's neurodes to discharge in random bursts because the radiation produces a degradation in the synaptic relays.

Later quantum failures are present in 33 per cent of gel pack relays. To adapt to the problem, Seven has the computer re-route all functional relays through subprocessor Chi-14.

Primary EPS conduits overload and there is a propulsion system failure. To compensate, Seven first re-routes power from stasis chambers 1 to 10, before cutting the ship's life support system and routeing the power back into the stasis chambers.