How to retrieve data from deep nested object?

I am trying to figure out how to loop over deep nested object in Django template.

Here is my app's code

models.py

from django.db import models

class Unit(models.Model):

    unit_number = models.PositiveIntegerField(blank=True, null=True, default=1)

    title = models.CharField(max_length=150, blank=True, null=True)

    scripture_ref = models.CharField(max_length=250, blank=True, null=True)

    def __str__(self):

        return self.title

class Subsection(models.Model):

    title = models.CharField(max_length=150, blank=True, null=True)

    subsection_text = models.TextField(default='SUBSECTION TEXT')

    unit = models.ForeignKey(Unit, on_delete=models.CASCADE)

class Question(models.Model):

    question_text = models.CharField(max_length=2000, default='QUESTION TEXT')

    subsection = models.ForeignKey(Subsection, on_delete=models.CASCADE)

views.py

from django.shortcuts import get_object_or_404

from django.shortcuts import render

from .models import Unit

def unitdetail(request, unit_id):

    unit = get_object_or_404(Unit, pk=unit_id)

    return render(request, 'correspondence_course/unit_detail.html', {'unit': unit,})

unit_detail.html (template)

<h1>Урок {{ unit.unit_number }}</h1>

<h1>{{ unit.title }}</h1>

{% for subsection in unit.subsection_set.all %}

    <h2>{{ subsection.title }}</h2>

    <div>{{ subsection.subsection_text }}</div>

    {% for question in subsection. %} # this is just for reference. It does not work

        <p>{{ question.question_text }}</p>

    {% endfor %}

{% endfor %}

As you can see I have three class models: Unit, Subsection with back relationship with Unit and then Question with back relationship with Subsection.

I managed to show in the template (see above) unit.title alone with subsection.title and subsection.subsection_text. It is all nice, but I cannot figure out how to loop over and display questions that are nested to Subsection(s).

Can you please help me to figure out how make it work?

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