Yasser:
Lets discuss the best practice for water entry with you Expensive grear.
Zodiac ( with surface current )
Drift from boat
Giant Stait
Beach entry with Surf
The best way is to go first in the water and then somone hands you that Camera.
I rarely find the conditions idealistic. So Lets be prepared for the extrems.
Did you ever face a similar situation ?
1) Zodiac or Small Boat (no DM) - I either lower the camera into the water with a rope, and jump in near it.
2) Drift from boat... either the DM passes it to me, or I lower it in and jump after it.
3) Giant Stride or other... same as above, either pass it down from someone on the boat, or lower it in first, and jump after it.
4) Beach Entry. I usually only take a single strobe setup on shore dives, since my regular shore dive is shallow, so this lightens the load quite a bit from dual DS-125's. I carry the camera down to the water, and then submerge it as soon as its possible, so that it doesn't get pounded by waves.
I have an Ikelite housing with a higher profile dome port, so this is why I don't jump with it. If I was using my small video rig, with no port on the front, I would and do jump in with it all the time. Also, If I had a more expensive housing like a Sea & Sea or a Subal, I might jump with those, since the ports attach to those like an SLR lens does, as opposed to the ikelite ports which clip on.