מפעיל חדר הבריחה בודק את מצלמת האבטחה.

Because in this sentence, מפעיל is being used as a noun: operator.

The full subject is:

מפעיל חדר הבריחה = the operator of the escape room

A learner might recognize מפעיל from the verb להפעיל = to operate / to activate, but Hebrew often uses the same pattern for a person who does the action. So:

• מפעיל can mean he operates / is operating in some contexts
• but it can also mean operator as a noun

Here, since it is followed by חדר הבריחה and then later another verb, בודק, the most natural reading is noun:
The escape room operator checks the security camera.

This is because מפעיל חדר הבריחה is a construct chain (in Hebrew: סמיכות).

In Hebrew construct phrases, the first noun often does not take ה, even when the whole phrase is definite. Definiteness is usually shown on the second noun.

So:

• חדר בריחה = an escape room
• חדר הבריחה = the escape room

And therefore:

• מפעיל חדר בריחה = an operator of an escape room
• מפעיל חדר הבריחה = the operator of the escape room

So even without ה on מפעיל, the whole phrase is definite because חדר הבריחה is definite.

חדר הבריחה literally means the room of the escape or more naturally the escape room.

It is also a construct chain:

• חדר = room
• בריחה = escape
• חדר בריחה = escape room

When you make it definite:

• חדר הבריחה = the escape room

Notice that the ה appears on the second word, הבריחה, not on חדר. That is normal in this structure.

Hebrew often expresses of relationships with a construct chain instead of של.

So Hebrew has two common ways to say something like the operator of the escape room:

1. מפעיל חדר הבריחה
   This is the more compact, noun-chain style.

2. המפעיל של חדר הבריחה
   This uses של = of / belonging to

Both can be understandable, but the construct form is very common and often sounds more natural in this kind of phrase.

The same thing happens in:

• מצלמת האבטחה = the security camera instead of
• המצלמה של האבטחה = literally the camera of the security, which is much less natural

Because בודק agrees with the subject, and the subject here is מפעיל חדר הבריחה, which is masculine singular.

So:

• בודק = masculine singular
• בודקת = feminine singular

Even though מצלמת האבטחה is feminine, that does not affect the verb here, because it is the object, not the subject.

So the sentence is:

• מפעיל חדר הבריחה בודק... = The male operator checks...

If the subject were feminine, you would say:

• מפעילת חדר הבריחה בודקת את מצלמת האבטחה.
  The female escape room operator checks the security camera.

Yes. בודק is the present-tense form of the verb לבדוק = to check / examine.

In Hebrew, present tense often looks like a participle. Here:

• בודק = checking / checks for a masculine singular subject
• בודקת = feminine singular
• בודקים = masculine plural / mixed plural
• בודקות = feminine plural

So בודק can mean:

• checks
• is checking

The exact English translation depends on context.

את marks a definite direct object.

Here the object is:

מצלמת האבטחה = the security camera

Because it is definite, Hebrew uses את before it:

• בודק את מצלמת האבטחה

This does not mean with here. It is just a grammatical marker showing that the next phrase is the direct object.

Compare:

• הוא בודק מצלמה = He checks a camera
• הוא בודק את המצלמה = He checks the camera

So in your sentence, את appears because the object is definite.

Because מצלמת האבטחה is another construct chain.

It comes from:

• מצלמה = camera
• אבטחה = security

In construct form, מצלמה becomes מצלמת:

• מצלמת אבטחה = a security camera
• מצלמת האבטחה = the security camera

So:

• מצלמה is the regular standalone form
• מצלמת is the construct form meaning camera of...

This is why the word changes shape.

It is singular.

The base word is:

• מצלמה = camera (singular)

In construct form it becomes:

• מצלמת

So מצלמת האבטחה means the security camera, singular.

The plural would be:

• מצלמות אבטחה = security cameras
• מצלמות האבטחה = the security cameras

The subject is:

מפעיל חדר הבריחה

The verb is:

בודק

A useful clue is that מפעיל חדר הבריחה forms a natural noun phrase:
operator of the escape room

Then בודק clearly functions as the action:
checks

So the sentence breaks down like this:

• מפעיל חדר הבריחה = subject
• בודק = verb
• את מצלמת האבטחה = direct object

This is one reason Hebrew learners need to get used to construct chains: several nouns can appear together before the main verb.

Yes. Hebrew present tense often allows both translations, depending on context.

So בודק can mean:

• checks
• is checking

If the sentence is just presented by itself, both are possible in English. Context would decide which sounds better.

Here are the main dictionary forms:

• מפעיל → from להפעיל as a verb, but here used as the noun operator
• חדר = room
• בריחה = escape
• בודק → dictionary form לבדוק = to check
• מצלמת → base form מצלמה = camera
• אבטחה = security

This is helpful because some words appear in changed forms inside construct chains, especially:

• מצלמה → מצלמת
• חדר stays חדר

Yes, this word order is completely normal.

The sentence is:

מפעיל חדר הבריחה | בודק | את מצלמת האבטחה

That is:

subject | verb | object

Hebrew often uses this order, especially in straightforward statements.

What may feel unusual to an English speaker is not the sentence order itself, but the fact that the subject and object each contain a construct chain:

• מפעיל חדר הבריחה
• מצלמת האבטחה

So the main challenge is usually the noun structure, not the overall word order.