I don't. I bought one in an early game and then had to spend the next few days running the martyr away from various attacks so as to not blow up my own base.

Tried the collaborating Martyr tactic with an ally to bust an enemy mine. It would have worked had he not hired a Pirate and intercepted the single man intercepting subs. We sent multiple (4 or them in 10 minute intervals between each other) but the pirate was too fast.

I added this strategy to the wikia, and it may need rewording.
Third bullet under Strategies.
Thanks for looking!

i think the martyr will always blow the mine or opponent pirate, if pro player use it.

cause mine just like sitting duck to martyr, he just need pass it really near to the mine and two/three single sub with short interval from ally to intercept it (cause a pirate can easyly intercept this. two/three single sub will cover it up) and BOOM mine blow easyly like sitting duck.

and the only thing can intercept this is a pirate. so opponent will sacrifice his pirate or his mine.

and martyr and nav combo is OP too to deal with mine. no one can stop it except a pirate sacrifice.

Oh I've only hired it once and that time I was very lucky with my success.
I was planning to launch the martyr at my enemy's mine to see what it would do... would it work? how long would it take? etc. Unfortunately I forgot to cancel the planned action, so the martyr set off with 0 drillers towards my enemy;s mine. Of course, my enemy, having played 5 games already, intercepted the martyr with 1 sub. At this point I felt defeated... How could I make such a stupid mistake like that?? (which is why I now always check my planned actions to see if everything is actually intended)....I thought about all the things I could do to try and still blow up his mine. It turns out, there were quite a few, and I used all of them...
1. Intercept the interception using a driller and promoting a navigator to admiral.
2. Gifting the martyr so that if my enemy accepted the gift I would send 1 driller from behind which would catch up to my martyr just before it reached his mine, thus blowing it up in the process.
3. Sending a driller from behind so that if 2. doesn't work, this driller will arrive at the base just after the martyr reaches his outpost so that he doesn't have enough time to launch the martyr somewhere else.
4. Sending more drillers than he has at his mine from another outpost so that it reaches his mine just after the martyr does like in 3. (if 3 doesn't work)

however, all of these can be countered easily by him.
1. Simply send another interception sub closer to his mine so that I don't have enough time to intercept his interception.
2. Sending drillers to intercept my drillers from behind. He won't activate the martyr because its his now. Instead his subs just pass right through each other.
3. Same as 2.
4. This one might seem a little tricky to counter at first, until I tell you that he actually had 2 saboteurs at his mine. AND he had a pirate at another outpost which he could've used to intercept 4.

However my enemy 'apparently' saw 4. as 'not going to activate the martyr' on his time machine so he didn't do anything about it. But it did activate the martyr (this may be a bug btw) so I did manage to destroy his outpost.