Once bjj students get to the purple belt and above, they tend to utilize the turtle position much more often.
Why?

1) Often after a failed double leg or other takedown attempt, you can end up on the bottom turtle with your opponent’s weight on top of you.

2) Instead of accepting a guard pass, advanced students know to go to turtle position and avoid surrendering the 3 points for a guard pass.
Less advanced students may say “Ok, my guard has been passed, now I must escape from side control.”

More experienced students will not accept bottom side so easily and transition to turtle.

This week Gracie Barra explores the bottom of the turtle position and shows some techniques and strategy to control and attack.
* Lastt week, Gracie Barra Blog looked at the turtle TOP position.

The Turtle Top – An Advanced Jiu-jitsu Position – Part 1

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4 Techniques From The Bottom Turtle:

1) Escape From Turtle
Now that you arrived in turtle position…what do you do? How to improve your position?
Prof Flavio Almeida from Gracie Barra Dana Point shows a technique to circle and reverse the opponent.
https://www.youtube.com/watch?v=XVTjBNo9kN8

2) Rolling Turtle Position Reversal
Gracie Barra HQ Head instructor Prof. Philipe Della Monica shows a highly effective technique to reverse the top opponent from turtle.
* Note the grip where Prof. Della Monica controls the arm before rolling.
https://www.youtube.com/watch?v=sMUk-0GkHtg

3) Rolling Shoulder Attack from Turtle
Bjj players can develop dangerous offensive attacks from the bottom turtle position.
Professor Robert Hill shows how rolling with a grip can lead to a shoulder lock submission.
https://www.youtube.com/watch?v=sZepUM2j_V4

4) Sit out Escape from Turtle
You just attempted a double leg takedown and your opponent sprawled.
Now you are stuck in the bottom turtle with your opponent controlling you on top.
Prof. Ulpiano Malachias shows how to escape from the bottom “head to head” turtle with a “sit out”.

on Gracie Barra : 6 Submission Attacks From the Top By Gracie Barra Black Belts
https://graciebarra.com/2016/03/6-submission-attacks/

Credits: Mark Mullen 
Gracie Barra Black belt based in Saigon, Vietnam
Twitter: @MarkMullenBJJ