I was just having some difficulty going into the tunnels on the ground. What might work is having some time where hitting a wall during a dive doesn't instantly cancel the dive.
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Hitting a wall during a dive doesn't cancel the dive right? You can just continue holding dive and you'll fall down and start sliding when you touch the ground. Only for breakable walls does it kinda cancel your dive by making you bounce off of the breakable wall, because you're not supposed to go through it and break it at the same time..