Пассажир отдыхает, в то время как судоходная компания проверяет спасательный плот.

Пассажир is in the nominative case because it is the subject of the sentence: the passenger is the one doing the action.

• Пассажир отдыхает = The passenger is resting
• If it were an object, you might see another case, for example:
  • Я вижу пассажира = I see the passenger

So here, nominative is used because пассажир is the doer of отдыхает.

Отдыхает is the 3rd person singular present tense of отдыхать.

That means it agrees with пассажир, which is singular:

• я отдыхаю = I rest / am resting
• ты отдыхаешь = you rest
• он/она отдыхает = he/she rests
• пассажир отдыхает = the passenger rests / is resting

In Russian, the present tense often covers both English rests and is resting, depending on context.

Russian normally uses the simple present form to express both:

• a general present action
• an action happening right now

So:

• Пассажир отдыхает can mean The passenger rests or The passenger is resting
• компания проверяет can mean the company checks or is checking

Russian does not need a separate tense like English am/is/are + -ing.

В то время как means while, whereas, or at the same time that, depending on context.

In this sentence, it means that two actions are happening at the same time:

• Пассажир отдыхает, в то время как судоходная компания проверяет спасательный плот.
• The passenger is resting while the shipping company checks the lifeboat.

Compared with пока:

• пока is often the more common everyday word for while
• в то время как sounds a bit more formal or explicit

For example:

• Пассажир отдыхает, пока компания проверяет плот.
• This is also natural.

But в то время как is perfectly correct and often feels slightly more literary or formal.

Russian normally uses a comma before a subordinate clause, and в то время как introduces one.

So the sentence is divided into:

• Пассажир отдыхает
• в то время как судоходная компания проверяет спасательный плот

This is very standard Russian punctuation.

A good practical rule: if a conjunction introduces a full clause with its own subject and verb, a comma is often needed.

Судоходная компания means shipping company or shipping line.

The adjective судоходный / судоходная / судоходное comes from the idea of navigation by ships or shipping.

So:

• компания = company
• судоходная компания = shipping company

Why судоходная?

Because компания is:

• feminine
• singular
• nominative

So the adjective must match it:

• masculine: судоходный
• feminine: судоходная
• neuter: судоходное
• plural: судоходные

Спасательный плот is the direct object of проверяет, so it is in the accusative case.

However, for inanimate masculine singular nouns, the accusative often looks exactly like the nominative.

So:

• nominative: спасательный плот
• accusative: спасательный плот

That is why it looks unchanged.

Compare with an animate masculine noun:

• nominative: пассажир
• accusative: пассажира

So Russian does mark the object, but with inanimate masculine nouns the form is often identical to the nominative.

Спасательный плот means lifeboat raft or more naturally liferaft / life raft.

Word by word:

• спасательный = rescue, lifesaving, emergency
• плот = raft

So this is specifically a raft used for safety or rescue at sea.

It is different from:

• лодка = boat
• спасательная шлюпка = lifeboat
• спасательный плот = life raft

The given word order is natural, but Russian word order is more flexible than English.

Standard version:

• Пассажир отдыхает, в то время как судоходная компания проверяет спасательный плот.

You could also rearrange parts for emphasis, for example:

• В то время как судоходная компания проверяет спасательный плот, пассажир отдыхает.

This puts more focus on the while-clause first.

However, inside each clause, the original order is very normal and neutral:

• subject + verb
• subject + verb + object

So learners should treat the original sentence as a good default pattern.

Russian has no articles like English a/an and the.

So:

• Пассажир can mean a passenger or the passenger
• судоходная компания can mean a shipping company or the shipping company
• спасательный плот can mean a life raft or the life raft

Russian relies on context to show whether something is definite or indefinite.

In this sentence, English could translate it in different ways depending on context:

• The passenger is resting while the shipping company checks the life raft.
• A passenger is resting while a shipping company checks a life raft.

Both are possible grammatically; context decides.

Both verbs are imperfective:

• отдыхать → отдыхает
• проверять → проверяет

They are imperfective because the sentence describes ongoing actions happening at the same time.

This is a very common use of the imperfective in Russian:

• ongoing process
• background action
• simultaneous action

If you used perfective verbs, the meaning would shift toward a completed result rather than an ongoing process.

For example:

• проверяет = is checking / checks
• perfective partner: проверит = will check / will complete the checking

So imperfective is the natural choice here because the sentence presents a scene in progress.

Yes, in many everyday situations you could say:

• Пассажир отдыхает, пока судоходная компания проверяет спасательный плот.

This is natural and often simpler.

But there can be a slight nuance:

• пока usually just means while
• в то время как can sound more formal, more explicit, or sometimes more contrastive, like whereas

In your sentence, both work, but в то время как sounds a bit more polished or written.

Russian adjectives agree with the nouns they describe in gender, number, and case, so their endings help you match them.

Here:

• судоходная matches компания
  • both are feminine singular nominative
• спасательный matches плот
  • both are masculine singular accusative/nominative form

So even if word order changes, agreement helps you see the relationships.

That is one of the big advantages of Russian inflection: endings often tell you what goes together.