How can you trade volume of zero for value of zero and be a...

How can you trade volume of zero for value of zero and be a cross trade

Over the weeks I have noticed an increase of this phenomena for Mermaid Marine Australia

Can anyone explain to me what this means and is it algorithmic trading

Below is the example

10:50:51 AM 0.000 0 0.00 XT

10:53:28 AM 0.000 0 0.00 XT

10:54:51 AM 0.000 0 0.00 XT

10:58:21 AM 0.000 0 0.00 XT

10:58:22 AM 0.000 0 0.00 XT

10:58:41 AM 0.000 0 0.00 XT

11:12:06 AM 0.000 0 0.00 XT

11:16:52 AM 0.000 0 0.00 XT

11:16:53 AM 0.000 0 0.00 XT

11:17:27 AM 0.000 0 0.00 XT

11:35:07 AM 0.000 0 0.00 XT

11:36:37 AM 0.000 0 0.00 XT

11:36:37 AM 0.000 0 0.00 XT

11:36:38 AM 0.000 0 0.00 XT

11:39:12 AM 0.000 0 0.00 XT

11:40:22 AM 0.000 0 0.00 XT



Note that at 11:36:37 there were two trades for zero volume for zero dollars