May one carry between two adjacent boats on Shabbat, and what conditions apply?

Does a balcony (gazuztra) protruding over water require surrounding walls before one may draw water through it on Shabbat?

4 opinions

Once valid walls are erected around a balcony over water, may one also pour waste water through the drawing hole into the water below?

3 opinions across 3 eras

Does a boat (ספינה) require surrounding walls or only a four-by-four tefach panel to permit drawing water from the sea on Shabbat?

4 opinions

When a boat's walls extend more than ten tefachim above the waterline, what arrangement is needed to permit drawing water from the sea?

4 opinions

May one pour waste water over the side of a boat onto its hull so it runs into the sea on Shabbat?

3 opinions

May one use a toilet on Shabbat that is built over water, given that waste falls directly from the reshut hayachid into the karmelit?

2 opinions

Does the suspended-wall leniency for a toilet apply when it protrudes outside a city wall over a dry moat (karmelit) rather than water?

3 opinions

Is the suspended-wall leniency available when a toilet is between two private houses belonging to two different people who have not made an eruv?

1 opinions