How do passengers get on submarines?

Answer 1

In port, submarines are accessed from a pier by a brow or gangway, essentially a portable walkway lowered into place by a crane from the pier to the main deck of the boat.

At sea, it depends on the vessel's size; for tugboats or pilot vessels, they have a an extendable brow; for small boats, passengers leave the vessel and come aboard using a Jacob's Ladder.

For helo transfers, the helo lowers a ladder or line, and the passenger embarks or disembarks. A crewmember on the deck must be in place to ground the line to the deck to discharge any static electricity buildup from the rotors, lest anyone on deck be shocked by a static discharge if touched by the line.