On smaller boats lower to the surface its the easiest way to get in, air cylinders are heavy so you spend most of the trip trying NOT to roll back into the water.
This also makes it safer then everyone trying to stand up and step in individually as it reduces the chance of unbalancing the boat and/or cracking someone in the dome with a hefty chunk of metal, instead, you count it down and just lean back, gravity and your gear does the rest, you might still get kicked in the head though.
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