Reference for Bava Batra 4:2
לֹא אֶת הַבּוֹר, וְלֹא אֶת הַדּוּת, אַף עַל פִּי שֶׁכָּתַב לוֹ עֻמְקָא וְרוּמָא. וְצָרִיךְ לִקַּח לוֹ דֶרֶךְ, דִּבְרֵי רַבִּי עֲקִיבָא. וַחֲכָמִים אוֹמְרִים, אֵינוֹ צָרִיךְ לִקַּח לוֹ דָרֶךְ. וּמוֹדֶה רַבִּי עֲקִיבָא, בִּזְמַן שֶׁאָמַר לוֹ חוּץ מֵאֵלּוּ, שֶׁאֵינוֹ צָרִיךְ לִקַּח לוֹ דָרֶךְ. מְכָרָן לְאַחֵר, רַבִּי עֲקִיבָא אוֹמֵר, אֵינוֹ צָרִיך לִקַּח לוֹ דֶרֶךְ. וַחֲכָמִים אוֹמְרִים, צָרִיךְ לִקַּח לוֹ דָרֶךְ:
(He has) not (sold) the bor [a cavity in the ground] nor the duth [a structure of stones above the ground in the form of a bor], even if he wrote (that he is selling) him the depth and the height (of the house). [He does not acquire the bor and the duth since their use (water storage) is distinct from (that of) the house. (They are not acquired) unless he writes "from the bottom of the depths to the heights of the heavens."] And he [the seller] must buy access rights [from the buyer to the bor and the duth. For the seller sells "generously," reserving nothing for himself.] These are the words of R. Akiva. The sages say: He need not buy access rights. [They hold that the seller sells "stintingly," so that when he sold the house, he reserved for himself access rights to the bor and the duth.] And R. Akiva concedes that if he said to him: "Except these" [the bor and the duth], he need not buy access rights, [for, being a superfluous condition, it is understood to refer to access rights.] If he sold them [the bor and the duth] to another, [leaving the house for himself], R. Akiva says that he (the buyer) need not buy access rights, [for the seller sells "generously," and when he sold him the bor and the duth, he also sold access rights.] The sages say that he must buy access rights. [The halachah is in accordance with R. Akiva.]